Question $1$

$1$

Point

What is the main difference between a switch and a router?

Switch forwards packets

Router forwards packets

Switch forwards based on MAC address and router forwards based on Network address

Router is used for Telephone Switching

Question $2$

$1$

Point

The process for calculating a Checksum includes: Sum of all data values, Divide the sum by divisor, Checksum is the remainder of the calculation.

True

False

Question $3$

$1$

Point

If a fiber optic cable has multiple beams of light $($different frequencies$)$ propagating in the core, it is called:

Single$-$mode Fiber.

Beam Fiber

Multistream Fiber

Multimode Fiber.

Question $4$

$1$

Point

What type of switching requires resources to be reserved during the setup phase and released during teardown phase?

Packet Switching

Circuit Switching

Line Switching

Telephone Switching

Question $5$

$1$

Point

A connection that can send or receive but not at the same time is called

Half Duplex

Full Duplex

Duplex

Serial

Question $6$

$1$

Point

Is WDM digital or analogue?

Yes.

No$.$

Digital.

Analogue.

Question $7$

$1$

Point

FCS is the short form for Frame check sequence

Blank $1$

Frame

Blank $2$

check

Blank $3$

sequence

Question $8$

$1$

Point

A fiber cable that has core size of $9$ microns is Single$-$mode Fiber.

True

False

Question $9$

$1$

Point

What action does a network node take when it detects a single$-$bit error or a burst error?

Notify Sender

Return Packet

Marks Packet with an error

Discard

Question $10$

$1$

Point

What type of error checking takes place in a Layer $4$ TCP transmission?

Parity

Checksum

CRC

FCS

Question $11$

$1$

Point

What action does a receiving system take when a checksum calculation fails?

Ignore the error

Return Packet

Discard packet.

Calculates FCS

Question $12$

$1$

Point

What are the two main parts of fiber cable?

Outer jacket

Core and cladding.

Fiber mesh

Plug and jack

Question $13$

$1$

Point

In an Ethernet frame, the error check redundancy is provided by

CRC

RCA

FSP

Checksum

Question $14$

$1$

Point

A $3$ kHz channel transmitting a signal experiencing SNR of $15.$ What is the theoretical bit$-$rate?

$45$bps

$4,500$bps

$12$Kbps

$45,000$bps

Question $15$

$1$

Point

High SNR is good.

True

False

Question $16$

$1$

Point

How many Bytes long is an IPv$4$ address?

$4$

$6$

$8$

$16$

Question $17$

$1$

Point

At Layer $4,$ a stream of Bytes can occupy multiple segments.

True

False

Question $18$

$1$

Point

How many Bytes long is the mandatory part of a TCP header?

$8$

$14$

$20$

$50$

Question $19$

$1$

Point

The Internet is a reliable network because it uses IP to provide connections among systems.

True

False

Question $20$

$1$

Point

TCP is a Process$$to$$Process communication protocol.

True

False

Question $21$

$1$

Point

What action best describes what a receiving system does when it calculates a non$-$zero TCP checksum?

Inform the sending system

Drops the connection.

Sets a transmission flag in Layer $3$ header.

Discard the segment.

Question $22$

$1$

Point

How many Bytes long is a UDP header?

$8$

$14$

$20$

$60$

Question $23$

$1$

Point

During a TCP data exchange part of the connection, what sequence of control flags is expected in the Layer $4$ header?

ACK, SYN$,$ ACK

PSH$,$ ACK, ACK

ACK, ACK, SND

ACK, FIN, SYN

Question $24$

$1$

Point

How many Bytes long is an IPv$6$ address?

$4$

$6$

$12$

$16$

Question $25$

$1$

Point

A system is creating a Layer $2$ frame that includes a TCP segment. At what Layer is the IP address added?

Layer $1$

Layer $2$

Layer $3$

Layer $4$

Question $26$

$1$

Point

When one station connects to one Access Point, what is the connection referred to as$?$

SSID

BSS

WDS

BSSID

Question $27$

$1$

Point

What are the $2$ types of antennas used in wireless LANs?

Omni$-$directional and Directional.

Long and Short

$2$G and $5$G

Two pole and Five pole

Question $28$

$1$

Point

What frequency bands does WiFi operate in$?$

$2\mathrm{.}4$MHz and $5$MHz

$2\mathrm{.}4$GHz and $5$GHz

$2$G and $5$G

$20$MHz and $50$MHz

Question $29$

$1$

Point

When the destination address in an a Layer $2$ frame is FF:FF:FF:FF:FF:FF$,$ the transmission is a broadcast.

True

False

Question $30$

$1$

Point

At Layer $3,$ a packet can only occupy one frame of any size.

True

False

Question $31$

$2$

Points

In the following diagram, a PC is connecting to a network for the first time. The PC is configured to obtain an IP address automatically. Match the $4$ letters to the frame types exchanged between the PC and the Server:

DHCP Process.jpg

Prompts

Answers

Question $2$

$1$

A

Select match

Question $2$

$2$

B

Select match

Question $2$

$3$

C

Select match

Ques