Deck 5: Analyzing Ethernet Lan Switching

Question 1

The process of sending frames out all other interfaces, except the interface on which the frame arrived, is called ________.

A) Forwarding
B) Replication
C) Flooding
D) Copying

Answer 1

Flooding

Question 2

The IEEE defines three general categories of Ethernet MAC addresses. What are these three types?

A) Anycast
B) Unicast
C) Loopback
D) Broadcast
E) Singlecast
F) Multicast

Answer 2

Unicast
Broadcast
Multicast

Question 3

When connecting multiple switches with redundant links, which of the following protocols helps to ensure that you will have a loop-free Ethernet network?

A) STP
B) HTTP
C) TCP
D) ARP

Answer 3

STP

Question 4

When STP has placed a port in the blocked state, this port ________.

A) Will receive and forward data frames only
B) Will receive data frames but cannot forward them
C) Will forward data frames but cannot receive them
D) Cannot receive or forward data frames

Question 5

Which of the following is the goal of establishing a loop-free environment?

A) This allows a switch to learn MAC addresses.
B) This allows a switch to forward only one copy of the message to the destination.
C) This allows the switch to examine the source MAC address of each frame.
D) This allows the switch to decide whether or not to forward a frame.

Question 6

Which of the following is an action that can be taken by a switch upon receiving a frame?

A) It may forward the frame out of a selected port.
B) It may filter the frame and not send it out of a port.
C) It may retransmit the frame out of the port at which it was received.
D) It may periodically retransmit the frame on all ports to assure receipt.

Question 7

Given the following address table, which port would be used to forward a frame destined for 0200.2222.2222?
$\begin{array}{llll} \text {Vlan }&\text { Mac Address} &\text { Type }&\text { Ports} \\---- & --------- & ------- & ----- \\1 & 0200.1111 .1111 & \text {DYNAMIC }& Fa0/1 \\1 & 0200.2222 .2222 & \text {DYNAMIC} & \mathrm{Fa} 0 / 2 \\1 & 0200.3333 .3333 &\text { DYNAMIC }& \mathrm{Fa} 0 / 3 \\1 & 0200.4444 .4444 & \text {DYNAMIC }& \mathrm{Fa} 0 / 4\end{array}$

A) Fa0/1
B) Fa0/2
C) Fa0/3
D) Fa0/4

Question 8

Given the following address table, which port will NOT retransmit a frame received from 0200.3333.3333?

$\begin{array}{llll} \text {Vlan }&\text { Mac Address} &\text { Type }&\text { Ports} \\---- & --------- & ------- & ----- \\1 & 0200.1111 .1111 & \text {DYNAMIC }& Fa0/1 \\1 & 0200.2222 .2222 & \text {DYNAMIC} & \mathrm{Fa} 0 / 2 \\1 & 0200.3333 .3333 &\text { DYNAMIC }& \mathrm{Fa} 0 / 3 \\1 & 0200.4444 .4444 & \text {DYNAMIC }& \mathrm{Fa} 0 / 4\end{array}$

A) Fa0/1
B) Fa0/2
C) Fa0/3
D) Fa0/4

Question 9

Which of the following items does a switch populate into its address table upon receiving a frame from an unknown source?

A) The source MAC address
B) The receiving interface
C) The destination MAC address
D) The destination port

Question 10

Which of the following prevents loops from a switch?

A) STP
B) MAC filtering
C) Disabling send/receive on some ports
D) VLAN

Question 11

Other than user-issued commands, what will cause a switch to remove an entry in an address table?

A) The age of the entry
B) The address table becoming full
C) The source address being recognized again
D) The destination address belonging to the same interface as the source

Question 12

Which of the following commands will provide statistics about incoming and outgoing frames on an interface such as the number of unicast, multicast, and broadcast frames in and out of the interface?

A) show interface name counters
B) show mac address-table
C) show interface name status
D) show mac address-table dynamic

Question 13

Which of the following will occur on a network with redundant links that does NOT use STP?

A) A frame will loop forever on the network.
B) The frame will transmit until a countdown timer is hit.
C) The frame will transmit once and may not reach its destination.
D) The frame will connect correctly as long as the redundancy is limited.

Question 14

Which of the following will occur when a switch encounters an unknown destination unicast frame?

A) The switch will flood the frame.
B) The switch will determine if the incoming frame has a known source.
C) The switch will filter the frame.
D) The switch will add the destination to its address table.

Question 15

Which of the following keywords for the show mac address-table dynamic command would be most beneficial to a network engineer troubleshooting a problem using a network topology diagram that does NOT contain MAC addresses?

A) interface
B) address
C) vlan
D) aging-time