Questions and Answers of Computer Networking

For n devices in a network, what is the number of cable links required for a mesh, ring, bus, and star topology?
Performance is inversely related to delay. When we use the Internet, which of the following applications are more sensitive to delay?a. Sending an e-mailb. Copying a filec. Surfing the Internet
What are some of the factors that determine whether a communication system is a LAN or WAN?
When a party makes a local telephone call to another party, is this a point-topoint or multipoint connection? Explain the answer.
How many point-to-point WANs are needed to connect n LANs if each LAN should be able to directly communicate with any other LAN?
When we use local telephones to talk to a friend, are we using a circuit switched network or a packet-switched network?
Explain the difference between a required RFC and a recommended RFC.
Explain the difference between the duties of the IETF and IRTF.
What is the first principle we discussed in this chapter for protocol layering that needs to be followed to make the communication bidirectional?
Answer the following questions about Figure 2.2 when the communication is from Maria to Ann:a. What is the service provided by layer 1 to layer 2 at Maria€™s site?b. What is the service
Which layers of the TCP/IP protocol suite are involved in a link-layer switch?
Answer the following questions about Figure 2.2 when the communication is from Maria to Ann:a. What is the service provided by layer 2 to layer 3 at Maria€™s site?b. What is the service
A router connects three links (networks). How many of each of the following layers can the router be involved with?a. Physical layerb. Data-link layerc. Network layer
Assume that the number of hosts connected to the Internet at year 2010 is five hundred million. If the number of hosts increases only 20 percent per year, what is the number of hosts in year 2020?
In the TCP/IP protocol suite, what are the identical objects at the sender and the receiver sites when we think about the logical connection at the application layer?
Assume a system uses five protocol layers. If the application program creates a message of 100 bytes and each layer (including the fifth and the first) adds a header of 10 bytes to the data unit,
A host communicates with another host using the TCP/IP protocol suite. What is the unit of data sent or received at each of the following layers?a. Application layerb. Network layerc. Data-link layer
Assume we have created a packet-switched internet. Using the TCP/IP protocol suite, we need to transfer a huge file. What are the advantage and disadvantage of sending large packets?
Match the following to one or more layers of the TCP/IP protocol suite:a. Route determinationb. Connection to transmission mediac. Providing services for the end user
Match the following to one or more layers of the TCP/IP protocol suite:a. Creating user datagramsb. Responsibility for handling frames between adjacent nodesc. Transforming bits to electromagnetic
In Figure 2.10, when the IP protocol decapsulates the transport-layer packet, how does it know to which upper layer protocol (UDP or TCP) the packet should be delivered?Figure 2.10 HTTP DNS SNMP
List some application-layer protocols mentioned in this chapter
Assume a private internet uses three different protocols at the data-link layer (L1, L2, and L3). Redraw Figure 2.10 with this assumption. Can we say that, in the data-link layer, we have
If a port number is 16 bits (2 bytes), what is the minimum header size at the transport layer of the TCP/IP protocol suite?
Assume that a private internet requires that the messages at the application layer be encrypted and decrypted for security purposes. If we need to add some information about the encryption/decryption
What are the types of addresses (identifiers) used in each of the following layers?a. Application layerb. Network layerc. Data-link layer

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