Computer Network Questions and Answers September 05, 2022

Use nslookup to obtain the IP address of the home page of one of the companies included in the S&P 500 index. The list of these companies can be found from many sources by searching online for the term "s&p 500 companies." Show the output from nslookup. Which name server was used to obtain the IP address? What pattern do you observe in the

Learning to monitor network traffic. Provide explanation of these steps and explain the answers to the questions 1. From one of the VM that is created, use the traceroute tool with www.google.com. as target. Before this step, read the man page for the traceroute tool (man traceroute). Comment on the outcome of your result--explain the output or

What is the shorthand corresponding to a subnet mask of 255.255.224.0 (the "/" notation) ? What is the Network ID of the following IP address: 10.11.12.13/25 Enter the last valid host on the network 10.11.0.0 255.255.0.0:

Consider a dataset with four negative examples (2, 0), (0, 2), (1, 1), (1, 1) and four positive examples (2,0), (1, 1), (0, 2), (1,1). Recall that perceptron is trained on a sequence of examples. On each example, the weights are updated if perceptron makes a mistake in classifying that example. Starting with w 00, use the perceptron algorithm to

Describe how you would select technologies and solutions in the virtualization of operating systems, virtual networking, and remote access for a more secure home network. How would you choose one over the other? What can you do that might convince non-technical people that virtualization is worth giving a try if they haven't already tried

Suppose we have a hierarchical DCN design as shown in the figure below. Each rack has 20 hosts and we need high throughput connections on flows from hosts i1.... 20 in each of racks 1, 2, 3, 4 to hosts j1,.,20 in each of racks 5, 6, 7, and 8 respectively. Each host is connected to the TOR with a 1Gbps link, and the connections from TORS to Tier2

There is a network that has an RTT of 20 ms and 100Gbits/sec throughout with a sender using Go-Back-n with window size 5, what is the maximum throughput in bits per second possible assuming frames are 1500 bytes? A protocol using CRC with polynomial 0x8E8E, Assume you have a packet with the following payload: 0xF0F0F0F0. What is the 16-bit CRC

What is oversubscription ratio, what is an appropriate oversubscription ratio for a network, and how does this help you choose the number of leaf switches in a network? How do you determine how many spine switches a network needs?

As an IT professional for a company, you need to consider a variety of factors to develop a strategy for backing up the company's data. What are some important factors to consider when developing a backup strategy? Explain in detail.

13. 15. 16. On an MDF what is the minimum area required in front of the terminals for installation and maintenance purposes a. 1000 mm x 1000 mm b. 1000 mm x 900 mm c. 500 mm x 500 mm d. 900 mm x 900 mm An MDF should be located in a. a secure location requiring a key to access and exit b. a fire escape stairwell c. any location that the customer

Discuss the cloud components in a campus based wireless network that will be included in the design. Also, compare the wireless protocols used. Explain the resources, emulator, and security measures for the client-side virtualization.

investigate 4 specific and recent virusesworms, software exploits, or malware packages (a total of 4, not 4 of each they may they may be from the same category, or multiple). These should be threats in the last 6 years. Note also the specific for example, you should not just write about randsomware or similar, but research the details about a

What is the reason for the researchers to send honey queries to IP addresses that do not offer any active DNS server IA DNS response from one of those IP address can therefore be efficiently identified as a forged DNS response. Ox20 can work more effectively for these IP addresses. it is more likely to trigger the censor to send forged DNS

What is Packet ID? Does it follow a sequence or is it random? How can you prove / demonstrate your answer? Why Windows Client Source Port is not related to the kind of service requested? Why for example SSH request is coming from a random Source Port instead of port 22? Is there any way you can fix request port number? If yes give example, if no

An exterior mounted wireless antenna has been attached via a cable back to a wireless access point. It is 30 feet from the point of radiation back to the WAP. Explain what is a primary concern.

What are the four options listed for the switchport port-security command? What are the two configuration options for the switchport port-security mac-address command? How many MAC addresses can be allowed using the switchport port-security maximum command? What are the three configuration options for the switchport port-security violation

Switch1 Physical Config CLI Attributes IOS Command Line Interface Switchportsecurity macaddress Unrecognized command Switchswitchport portsecurity macaddress Unrecognized command Switchswitch port portsecurity macaddress Invalid input detected at marker. Switch enable Switchswitchport portsecurity macaddress Invalid input detected at marker.

At your workplace or school, research to determine 1-5 network devices in your hierarchal model. Make a simple network topology using Packet Tracer software. Place 1-5 devices at the appropriate levels of the Cisco three-layer hierarchical model design. The model must include: A labeled hierarchical model (access layer, distribution layer, and

Does our legal system in Australia guarantee access to justice? why or why not? use this article below to get the ideas please: Four pro bono lawyers unlock in-person legal services for refugees in Northern Tasmania https://www.abc.net.au/news/2022-12-22/tasmanian-refugee-legal-service-commonwealth-funding/101796506

Why do you think SSH version 2 is preferred over SSH version 1? Explain in detail. Why do you think one of the main functions of a LAN switch is not to route IP packets? What do you think might occur if the Spanning Tree Protocol were removed or disabled from a LAN switch?

Which two requirements are clear indicators that you should position an MG cellular gateway alongside an MX device instead of MX device with integrated LTE? a. USB port for cellular failover b. Dual SIM c. Weak indoor Signal d. indoor use

Given the AM modulated carrier (i.e., signal) equation, S(t) = 0.7[1+1.8cos (24E3t)] cos(26E9t), what is the original message equation, signal bandwidth, and determine whether you will experience signal distortion? a. m(t)=1.26cos(26E6t), B=12,000Hz, you will experience distortion b. m(t)=2.57cos(24E3t), B=8000Hz, you will not experience

Given the following parameters, determine the correct sinusoidal equation for a cosine wave: f=42kHz, A=3v, (phase angle)= -/16 radians. a. 3cos(242t -/16) b. 41cos(242t +/16) c. 3cos(242E3t -/16) d. 42cos(23t + /16)

Make deep internet research on the different software license models. i.e. freeware, shareware, subscription, lifetime license, etc. Dig deeper into the history of IT from 1970 explain the differences and compare different models

Select the correct statement(s) regarding "full and "partial" mesh networks. a. Adding new nodes to a full mesh network is simpler than adding new nodes to a partial mesh network b. When designing a partial mesh network, the user's availability and reliability requirements help to determine the number of links needed between nodes c. Every node in

Select the correct statements) regarding guided mediums a. coaxial cables are always in a balanced configuration b. fiber optic cables require that the refractive indices of the core and cladding be the same c. When multiple unshielded twisted pair cables are used to send data in parallel, the transmitted signal is susceptible to delay skew d. all

Create PHP page named directorytraversalpart1.php in your droplet web root This PHP page will display all files and folders of path that will be given to it via a query string parameter without any validation checking Insert the following content for the php page

The figure below shows a portion of the internet with four autonomous systems, one of which is shown with four routers, each with its own16 subnet. Note that each of the other ASs has a 8 subnet. The blank routing table at right is for router C. Complete the table, providing an entry for each of the seven subnets. Assume that AS1 uses OSPF as its

What do you believe should be the primary security guideline(s) when designing the authorization for access to a VPNs and for VPN users? How would you utilize them, and how would you enforce them explain.

Discuss why the star topology ultimately won out over other LAN topologies explain and provide resources. Include in the discussion why Ethernet became the dominant LAN technology vs Token Ring. what are some of the older legacy Ethernet technologies, and how have things changed in the time since these technologies? How would 10 Gbps work on

Please answer the questions based on the following TCP congestion window chart Congestion Window Size (segments) 45 40 35 30 25 20 15 10 5 0 5 10 15 20 (a) Identify the intervals of time when TCP slow start is operating. (b) Identify the intervals of time when TCP congestion avoidance is operating (AIMD). (c) What is the initial value of

Your team was hired by Tony Stark to take action against some detected wireless attacks on his enterprise network. Despite him knowing a lot of technical things, he needs your help to implement defenses against a detected rogue access point and an evil twin. Explain what actions can you take to protect his network against these two attacks?

Subnetting You have been selected to interview for an intern network engineer position where you are asked to perform subnetting based on the following information Network address 192.168.10.0 Subnet mask 255.255.255.128 1.1 Determine the number of available subnets. 1.2 Determine the number of hosts available per subnet. 1.3 Determine the valid

The following are tasks achieved by the controller in SDN (choose all applicable) a. The configuration of the hardware to control the data forwarding b. The assignment of network intelligence task to the data plane O c. The configuration of relevant network security specifications Od. The management of access to the network components Oe. The

Could you explain the differences between live connections and data extraction? What are the pros and cons of live connections and data extracts?

You open your preferred browser, you type www.bellevuecollege.edu and hit enter. Milliseconds later, Bellevue Colleges webpage appears in your browser. Using the OSI model, explain how the data travels from your browser to Bellevue Colleges webserver and back to your browser. You may be as vague or as detailed as is necessary for you to fully

What is an NOS (network operating system) and what are the different types of NOSs? Explain the basic key features of a network operating system and standard server applications.

Why should you encrypt guest traffic? Choose 3 A. To give the guest not only a connection but a secure connection B. To protect your organization's reputation C. To make it harder for guests to access the private network D. To make it easier for guests to access the private network E. To protect your guest users' traffic

(A) Write out a truth table for S, R and Q where S and R are functions of X, Y, and Z and Q is a function of S and R. The headings for the columns in the truth table should be X, Y, Z, S, R and Q, X, Y and Z are inputs, and S, R and Q are outputs. (B) Write the expressions for S and R in terms of X, Y and Z. You can do this either from the truth

A singlephase transformer used for street lighting (highpressure sodium discharge lamps) converts 4.6 kV rms to 230 V rms with an efficiency of 0.6. Assuming the power factor seen by the high voltage source is 0.8 and the primary apparent power is 16 kVA. Find the transformer turns ratio.

We've intercepted this message that was encrypted using some kind of simple autokey cipher where the ciphertext is used as the subsequent encryption key. We don't have the initial encryption key but we know that the initial encryption key is only byte, so it should be easily breakable. d2badfff99f594f3d3bac9e9baf1a885c491c58aa79eaa9bab What is the

a. Describe the RSA encryption and decryption algorithms b. Consider using RSA encryption with n = 209 = (11)x(19). What is wrong with using e = 5 as the encryption key? What is the smallest and the largest e that would work?

You have house guests arriving for the weekend and must share the Wi-Fi network details, including the password. This is an example of what encryption type? Group of answer choices a) Cryptography b) Hashing c) Asymmetric Encryption d) Symmetric Encryption e) All of the above f) None of the above

Of the following encryption protocols, which occurs at the lowest layer of the network stack? a. IPSec b. SSH c. HTTPS d. TLS

Cryptography: Algorithms and Applications Kerberos relies exclusively on __________ . Group of answer choices a. symmetric encryption b. asymmetric encryption c. private key encryption d. public key encryption

Differentiate between data encryption standards and advanced data encryption standards. Explain in detail what makes advanced data encryption standards superior to data encryption standards.

Which of the options below would be best for security and efficiency? a. Use single-key encryption for the message and double-key encryption for the single key that was used. b. Use single-key encryption for the message and single-key encryption for the single key that was used. c. Use single-key encryption for the message and single-key

The meet-in-the-middle attack demonstrates that A. Single encryption is not much more secure than Double encryption B. Double encryption is not much more secure than triple encryption C. Double encryption is not much more secure than single encryption D. All of the above

Is using the Data Encryption Standard (DES) encryption algorithm a good idea to be used for encrypting our programs? If not, what are some of the alternative encryption algorithms to be used in encryption.

Write a software program that encrypts and decrypts user input data by using symmetric key encryption methods.

Which statement is incorrect O symmetric encryption is faster than asymmetric encryption O asymmetric encryption is faster than symmetric encryption O symmetric encryption cannot be used for nonrepudiation of contracts O The key is shared by both parties in symmetric encryption

In an open key cryptography system, to ensure the data confidentiality, which key should be opened to the public O The encryption key O The decryption key Both encryption key and decryption key O Neither encryption key nor decryption key

AWS S3 Bucket Encryption Create an S3 bucket and enable server-side encryption using AWS KMS. Test the encryption by trying to access the data in the bucket without the encryption key.

What is the best explanation of what DNSSec adds to DNS security? a. DNSSec adds authentication, and encryption and verifies the accuracy of the DNS reply b. DNSSec adds authentication but doesnt add encryption to ensure confidentiality c. DNSSec adds encryption for confidentiality d. DNSSec adds authentication and encryption for confidentiality

Describe the concept of database encryption. How can encryption be used to provide security in the database? Explain what encryption features are contained in Microsoft SQL Server.

Explain in detail how a network administrator can use network security principles to protect networked systems. Use the principle of Defense in Depth where you use routers, firewalls, intrusion detection systems (IDSs), and intrusion prevention systems (IPSs).

A device that generates alerts when it observes potentially malicious traffic is called an ____. A. intrusion prevention system B. intrusion detection system C. intrusion system D. intrusion repair system

What protocol exists in the TCP/IP models Application layer? a. IP b. ICMP c. UDP d. SMTP A(n) ____ is a data structure that stores all information (such as file permissions, ownership, and file type) about a file except the actual data and filename. a. directory b. inode c. symbolic link d. hard link

Discuss the differences between IDS ( Intrusion Detection System ) and IPS ( intrusion Prevention System). How do both IDS and IPS relate to the firewall? Do we need both intrusions systems to enhance system security ( and why )?

What kind of security threat involves a hacker obtaining administratorlevel access to a computer or network O Trojan Worm Rootkit What is the first layer of the TCPIP Protocol Network Interface Transport Botnet Protocol Physical

Research and find an example of either an intrusion detection (IDS) or intrusion prevention (IPS) system. The IPS or IDS system you select can be designed to protect at any layer (network, host, physical, etc.). Provide a summary of the IDS or IPS system and a high-level overview of how it functions. There are hundreds of products on the market

TCPDump is used by Wireshark to capture packets while Wireshark own function is O to provide a graphical user interface (GUI) and several capture filters to act as an intrusion prevention system (IPS) by stopping packets from a blacklisted website or packets with payloads of viruses. Oto defend the network against TCP SYN Flooding attacks by

Miriam is a network professional. She wants to increase security where the corporate network connects to the Internet. Which of the following provides deep packet inspection and threat intelligence analysis to assist with the management of malware and other threats? a. An authorization, authentication, and accounting (AAA) server b. An intrusion

Rachel is investigating an information security incident that took place at the high school where she works. She suspects that students may have broken into the student records system and altered their grades. If correct, which one of the tenets of information security did this attack violate? a. Availability b. Confidentiality c. Nonrepudiation

Which of the following is not considered a layer of a network architecture? a. Access layer b. Distribution layer c. Core layer d. Intranet layer A __________ is a secure server that adds layer of security to a network and acts as a buffer between a LAN and less secure networks. a. Honey pot b. Back door c. DMZ d. Bastion host An __________ is a

Provide detailed notes on two topics below SP 800-30 Rev. 1 - Guide for Conducting Risk Assessments Link below SP 800-18 Rev. 1 - Guide for Developing Security Plans for Federal Information Systems Link below

csrc.nist.govpubssp80030r1final

Task 1 Develop an IP Addressing Scheme using the following informtion Starting Network 172.16.80.024 Blue LAN subnet hosts 100 18 Red LAN subnet hosts MainRTR Gig00 First host address in Red LAN MainRTR Gig01 First host address in Blue LAN RedSW Vian1 SVI Second host address in Red LAN BlueSW Vian1 SVI Second host address in Blue LAN PC1 Last

Create static IP addresses for your network hardware. You do not have to use CIDR for your IP addresses, but you should consider logically grouping your hardware The subnet that you're working with is 192.168.123.0/24.

Which of the followings is FALSE about FQDN and DNS The root of FQDN is on the far right. Each domain can have subdomains. DNS are organized into a treelike structure. IANA registers domain names for Internet use. None. All above are correct. Which of the followings is NOT TRUE about OSPF Complex protocol for routers Converges faster than RIP Most

P P P P In the following example, please identify A message unaffected by process failure. . . . . . An orphan message A delayed message A duplicate message A lost message m m. m m4 m6 m7 Failure m5 Recovery mg

Configure the network as follows: 1) You have been allocated subnet 192.168.1.0/24. Subnet this into four subnets as follows 2) Subnet 1 for site 1 3) Subnet 2 for the link between R1 and the Internet Router 4) Subnet 3 for site 2 5) Subnet 4 for the link between R2 and the Internet Router 6) Configure the routers per the instructions in the

PCPT PC0 PCPT PC1 PCPT PC2 PCPT PC3 PCPT PC4 PCPT PC5 ServerPT Server 1 365024PS Switch1 365024PS Switch1(1) ServerPT Server2 GO00 Last IP GO00 Last IP Configure the network as follows 1) You have been allocated subnet 192.168.1.024. Subnet this into four subnets as follows 2) Subnet 1 for site 1 SR4321 R1 SR4321 R2 S010 First IP S010 First IP

The network consists of 5 PC's and five Multilayer switches (MLS). PC1 - PC5 connect to MLS1 - MLS5 on fa0/1 port each. The IP addresses for vlan 1, Management and MLS, Loopback address are documented in the included spreadsheet. PC1 is on vlan 10,PC2 is on vlan 20, PC3 is on vlan 30, PC4 is on vlan 40 and PC5 is on vlan 50. MLS1 connects to MLS2

Build the network with the following specifications using packet tracer as shown in diagram below PCPT PC1 PCPT PC2 356024PS Multilayet Switch 1 356024PS Multilayer Switch2 PCPT PC3 356024PS Multilayer Switch4 356024PS Multijeyer Switch3 PCPT PC4 30024PS Multilayer Switch5 PCPT PC5

Internet of Things, as one of the most emerging scenarios and technologies for the cyberphysical systems, the demand for hardware and software in the network has increased dramatically. And it will continue to grow with the rapid development of smart systems. Referring to Gartner (one of the leading research and advisory companies) Hype Cycle for

a. Using Distance vector, calculate the first round of R2 routing update in the network shown in Fig 1. R5 X1 X 3 Y 8 R6 5 2 9 R4 X2 Y 1 3 Figure 1 A Sample Network Topology 2 R3 R1 1 3 R2

Which network device is capable of blocking network connections that are identified as potentially malicious? a. Intrusion prevention system (IPS) b. Demilitarized zone (DMZ) c. Web server d. Intrusion detection system (IDS)

Gina is preparing to monitor network activity using packet sniffing. Which technology is most likely to interfere with this effort if used on the network O Transmission Control ProtocolInternet Protocol (TCPIP) O Secure Sockets Layer (SSL) O Domain Name System (DNS) O Dynamic Host Configuration Protocol (DHCP) Ricky is reviewing security logs to

Consider the following information which is contained in the Hosts File on an operating system www.5NTCM002W.ac.uk 161.1.2.32 i) Explain how the above information is utilised by the system. State any data structures that will be used. ii) Using the information above, explain how it can protect against a DNS (Domain Name System) Cache Poisoning

Security network administrators can create their own ACL rules for firewall based on which of the following attributes. I. II. III. IV. A. B. C. D. I. II. III. IV. Address Packet 9. Choose the objectives of ethical hacking from the white hackers prospective Determine the security posture of the organization Find and penetrate invalid parameters

(a) Define the following terms from the context of cyber security Vulnerability Threat Attack (b) Describe three nontechnical techniques that an attacker could use during the reconnaissance stage of an attack. (c) Consider the following cryptographic cipher (d) Alice K (H(msg), K (msg)) (i) Bob (i) Draw a block diagram showing how the receiver

Explain that a new certification is available to help security professionals learn and hone their skills: the Computing Technology Industry Association (CompTIA) Cybersecurity Analyst, or CySA+ for short. Explain that threat actors can also use automated tools to harvest email addresses when collecting web information. Explain that it is not a

Which of the following is not an objective of cryptography? A. Confidentiality B. Integrity C. Availability D. Non-repudiation 2/ Which is not an attribute of a one-way trap door? A. It is a mathematical function that is easier to compute in one direction than the opposite direction B. The forward direction of a one-way function can take seconds

A network administrator needs to ensure users data are securely sent and received. Which network protocol should the administrator use IPX IP IPSec NetBeui Which risk management strategy is a company implementing when deciding not to address low risk vulnerabilities Mitigate Accept Avoid Transfer 0000 A companys sensitive information was accessed

As part of network attack, port scanner, such as NMAP is for O information gathering O vulnerabilities analysis launch of attack cleaning up,Most tool are available for multiple operating systems, but some use specific operating system library, like the following tool being dependent on LINUX libc O Snort Ettercap Ethereal Net2pcap

Financial institutions have made significant investments in their e-commerce initiatives. However, in 2016, a survey of financial institutions reported that over 70% of financial organizations were affected by denial-of-service (DoS) attacks and 17% of the respondents had encountered ransomware in conjunction with the attacks. Their e-commerce

A). What is Role-based Access Control? Why is RBAC preferred for employee accounts with high turnover rates in certain sectors? Give a concrete example in the context of a large hospital. B). A client in the banking industry is interested in buying and establishing an Intrusion Detection System (IDS) and/or Intrusion Prevention System (IPS) to

Give at least 3 design approaches or considerations for an IDS and justify why they are important. what is an Intrusion Detection System (aka IDS)?

To protect business network systems, ____ is considered one of the most reliable security measures today a. Firewalls plus proxy servers b. Virtual Private Network (VPN) c. Intrusion Prevention System (IPS) d. Intrusion Protection System (IDS)

Which type of firewall operates at the application layer of the OSI model and can detect and block application-specific attacks? a. Application-level firewall b. Circuit-level firewall c. Packet filtering firewall d. Stateful inspection firewall 2. Which type of intrusion prevention system (IPS) operates on a host and can detect and prevent

An organization wants to identify risks to its networks, including potential vulnerabilities to its operating systems, services, and applications. How should the organization identify these risks Perform penetration testing Begin social engineering training Install updated antivirus software Upgrade all network servers,A hacker wants to steal

Two security technologies available to secure networks are Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS). An IDS detects unauthorized user activities, attacks, and network compromises. IDS' come in two types: host-based and network-based. An intrusion prevention system (IPS) is very similar to an IDS, except that in

What is meant by defense in depth (DiD) within a computer network o The applications being all up to date on patches. o The use of multiple tools and methods in an overlapping manner. o The use of an applicationaware firewall on the perimeter. The reliance on an intrusion prevention system (IPS) within the network.

(a) Describe the differences between a host-based Intrusion Prevention System (IPS) and a network-based IPS. (b) What are three benefits that can be provided by an IPS compared to an IDS? (c) One form of IDS starts operation by generating an alert for every action. Over time, the administrator adjusts the setting of the IDS so that common, benign

You have set up a training session for new Linux system administrators and you are discussing log files, their format, their location, and their contents. In general, where are most Linux system logs located varlog etclogrotate.d Osyslogd varlogjournal QUESTION 10 What is the process of verifying that data has not been modified, whether

Explain the type of active attacks that takes place on the network. Explain the Network Security Access Model Give example of Security Requirement related to confidentiality, Integrity and Availability Give a brief explanation of passive attack and active attack

List and define categories of network access and configuration and network security compliance from your research. Explain the difference between symmetric encryption and public-key encryption. what are the distinctions among the terms public key, private key, and secret key?

The new Company, which will specialize in hosting online examinations, has just hired you to be the network administrator responsible for all network platforms and services. The data network will be located in a single data center. The Chief Security Officer (CSO) has asked you to provide a basic network security plan that would provide critical

You have to protect your network consisting mainly of: Email users, Wireless guest users, and Internet access. Which network security devices would you suggest installing first and why explain in detail.

Explain what types of equipment or components of Web Based Information System Network are required for a hospital. To have Global Access and connections within the facility. For example Switch, Router etc.

Explain in detail.

Based on your understanding and with your own words, indicate the functions of the following components of a flow table in OpenFlow control a. Match fields b. Priority c. Instructions d. Timeouts

The Internet Protocol Suite contains the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP). Each Protocol has it strengths and weaknesses. What type are three types of applications that should use TCP, and three types of applications that should use UDP? Why should these applications use the stated protocols?

There are more situations in which a disaster recovery plan is needed to restore IT operations to an organization. The causes for implementing a DR plan may include some not commonly considered whenthe plan is drafted. These include: Hardware and equipment failure Environmental catastrophes Viruses and other infections Malicious intent Human error