What would be the destination Layer 2 address in the frame header for a frame that is being forwarded by Dubai to the host address of 172.30.4.4?

The correct answer is C. 694. This question refers to a Frame Relay network topology. In Frame Relay, Layer 2 addresses are DLCIs (Data Link Connection Identifiers) - locally significant virtual circuit numbers, not MAC addresses. When Dubai forwards a frame destined for host 172.30.4.4, it looks up the…

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Question

What would be the destination Layer 2 address in the frame header for a frame that is being forwarded by Dubai to the host address of 172.30.4.4?

Options

A825
B230
C694
D387

How the community answered

(18 responses)

A
17% (3)
B
6% (1)
C
72% (13)
D
6% (1)

Explanation

This question refers to a Frame Relay network topology. In Frame Relay, Layer 2 addresses are DLCIs (Data Link Connection Identifiers) - locally significant virtual circuit numbers, not MAC addresses. When Dubai forwards a frame destined for host 172.30.4.4, it looks up the destination IP in its routing table, determines the next-hop, and then maps that next-hop to the appropriate DLCI using an inverse ARP or static Frame Relay map. According to the topology referenced by this question, DLCI 694 is the correct local circuit identifier that Dubai uses to reach the segment containing 172.30.4.4. The other DLCIs (825, 230, 387) map to different virtual circuits in the Frame Relay cloud.

Topics

#Layer 2 forwarding#Frame Relay DLCI#destination address#frame forwarding

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