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Question 1

The following figure shows the configuration of a sub-interface on a router. For which VLAN does the sub-interface receive tagged data frames?

A20

B1

C30

D100

Correct answer: D

Comprehensive Explanation= The command dot1q termination vid 100 in the configuration specifies that the sub-interface is configured to receive tagged data frames for VLAN 100. VLAN tagging ensures that frames are properly identified and routed through the correct VLAN, and the sub-interface is associated with a specific VLAN ID to handle the tagged traffic.

Question 2

The network administrator has decided to configure link aggregation in the enterprise network. Which of the following represent advantages of link aggregation?

ALoad balancing.

BImproved bandwidth.

CEnhanced reliability.

DImproved security.

Correct answer: A, B, C

A (Correct) - Load Balancing: Link aggregation distributes traffic across multiple physical links, reducing congestion and improving performance.

B (Correct) - Improved Bandwidth: Multiple links act as a single logical link, increasing the total available bandwidth.

C (Correct) - Enhanced Reliability: If one link in an aggregated group fails, traffic is rerouted through the remaining links, improving network resilience.

D (Incorrect) - Improved Security: Link aggregation does not inherently improve security; it primarily enhances performance and fault tolerance.

Thus, the correct answers are A, B, and C.

Question 3

Refer to the following configuration of a switch interface. Which of the following statements is false?

interface GigabitEthernet0/0/1

port link-type trunk

port trunk pvid vlan 200

port trunk allow-pass vlan 100

AIf the VLAN tag carried in a data frame is 100, the switch removes the VLAN tag before sending the data frame.

BIf the interface receives data frames without VLAN tags, the switch needs to tag the data frames with VLAN 200.

CThe interface cannot send data frames tagged with VLAN 200.

DThe link type of the interface is trunk.

Correct answer: A

In trunk mode, the interface can forward frames tagged with VLANs specified in the allow-pass list (here, VLAN 100) without removing tags. However, if an untagged frame is received, it is assigned to the PVID (here, VLAN 200). This configuration allows both tagged and untagged traffic, with the PVID determining the VLAN for untagged frames.

Question 4

What is the TPID value defined by IEEE 802.1Q?

A0x9100

B0x8100

C0x8200

D0x7200

Correct answer: B

TPID Definition:

TPID (Tag Protocol Identifier) is a field in the Ethernet frame header that indicates the presence of an 802.1Q VLAN tag.

IEEE 802.1Q defines the TPID value as 0x8100.

Why Other Options Are Incorrect:

0x9100: Used in some proprietary protocols but not IEEE standard.

0x8200 and 0x7200: Not valid TPID values.

Question 5

On the network shown in the figure, the router receives a data packet with the destination IP address 11.0.12.1 from Host A.

After the packet is forwarded by the router, which of the following are the destination MAC address and destination IP address of the data packet?

AMAC-C, 11.0.12.1

BMAC-D, 11.0.12.1

CMAC-B, 11.0.12.1

DMAC-D, 10.0.12.2

Correct answer: C

Comprehensive Explanation= When Router A forwards the packet to Router B, the destination IP address (11.0.12.1) remains unchanged as it is still meant for Host B. However, the destination MAC address changes to MAC-B, which belongs to Host B, since MAC addresses are only used for local network hops

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