Question 1.
What is the network layer responsible for?

A. Providing the physical address to the packet.
B. Determining the path to the remote host.
C. Providing reliable communications from host to host.
D. Formatting the PDU.

Answer: B

Question 2.
Which of the following are basic router functions? Choose two.

A. Perform a Layer 2 header lookup
B. Broadcast a Layer 2 packet to all the interfaces.
C. IP header examination.
D. Determine the best path to the destination.

Answer: C, D

Question 3.
Which ATM adaptation layer is usually used for transporting IP datagrams?

A. AAL1
B. AAL2
C. AAL 3
D. AAL 5

Answer: D

Question 4.
Which of the following are data rates defined for Ethernet operation over copper and fiber optic cabling? (Choose three.)

A. 1 Mbps
B. 10 Mbps
C. 1000 Mbps
D. 10,000 Mbps

Answer: B, C, D

Question 5.
An Ethernet switch receives a frame addressed to an unknown destination. 

Assuming the frame is error-free, what will the switch do with the frame?

A. Hold it in a buffer until it learns the port on which the destination is located
B. Flood the frame out all ports except the source port
C. Filter the frame and restrict it only to the source port
D. Age out the source address forwarding table entry

Answer: B

Question 6.
How does collision detection operate in the CSMA/CD algorithm?

A. It allows multiple hosts to exchange data simultaneously on the same medium
B. It allows multiple hosts to share the same medium by ensuring that only one host can transmit 
    at a time
C. Detects collisions on a full-duplex link
D. A host will only transmit upon receipt of the token

Answer: B

Question 7.
The Media Access Control (MAC) sub-layer is responsible for which two functions? (Choose two.)

A. Directly interface with the transport layer
B. Link integrity testing
C. Physical addressing
D. Data transmission synchronization

Answer: C, D

Question 8.
What is the purpose of carrier sense in the CSMA/CD algorithm?

A. To ensure the host is able to detect an operational physical link before transmitting.
B. The host is able to detect the transmission speed of the Ethernet switch port to which the host 
    is connected
C. The host will only transmit data when it detects that no other devices are transmitting
D. The host will only transmit upon a timer expiry

Answer: C

Question 9.
Which statement best describes a Spanning Tree Protocol (STP) root bridge/switch?

A. It is the switch on the network with the lowest bridge priority value
B. It is the switch with the highest numeric Media Access Control (MAC) address
C. It is the only switch on the network through which traffic flows
D. It is responsible for removing duplicate frames from the network

Answer: A

Question 10.
An Ethernet switch with redundant links has the following entries in its Forwarding Data Base (FDB):
MAC Address Port
00:60:AC:1F:E0:11 1
00:F0:DE:12:3C:87 2
It receives on port 2 a frame with the source Media Access Control (MAC) address 00:60:AC:1F:E0:11, and destination address 00:F0:DE:12:3C:87. 

What will the switch change in its FDB?

A. It will remove the previous entry for MAC 00:F0:DE:12:3C:87 and replace it with a new one 
    mapping this address to port 1
B. It will set a timer on the previous entry for MAC 00:60:AC:1F:E0:11 and create a new entry 
    mapping this address to port 2
C. Replace the previous entry for MAC 00:60:AC:1F:E0:11 with a new one mapping this address 
    to port 2
D. It will create a new entry for MAC address 00:60:AC:1F:E0:11 mapping this address to port 2 
    and a new entry for MAC address 00:F0:DE:12:3C:87 mapping this address to port 1

Answer: C

Question 11.
An 12-port Ethernet switch running the Spanning Tree Protocol (STP) can have how many root ports?

A. 1
B. 2
C. 4
D. 12

Answer: A

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