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101 · Question #546

Client A from the 192.162.168.0/24 network wants to send a Ping to Client B on 10.10.10.0/24. - The Default Gateway from Client A is 192.168.0.1 - The MAC Address of Client A is 00:11:11:11:11 - The M

The correct answer is C. 00:33:33:33:33. When sending a packet to a host on a different network, a device wraps the packet in a Layer 2 frame addressed to the default gateway's MAC, not the final destination's MAC.

Section 1: OSI Model, Network, and Application Delivery Basics

Question

Client A from the 192.162.168.0/24 network wants to send a Ping to Client B on 10.10.10.0/24.

  • The Default Gateway from Client A is 192.168.0.1
  • The MAC Address of Client A is 00:11:11:11:11
  • The MAC Address of client B is 00:22:22:22:22
  • The MAC Address of Default Gateway is 00:33:33:33:33

What is the destination MAC Address of the ping packet when it leaves client A interface card?

Options

  • A00:11:11:11:11
  • Bf1: f1:f1:f1:f1
  • C00:33:33:33:33
  • D00:22:22:22:22

How the community answered

(21 responses)
  • A
    5% (1)
  • B
    5% (1)
  • C
    76% (16)
  • D
    14% (3)

Why each option

When sending a packet to a host on a different network, a device wraps the packet in a Layer 2 frame addressed to the default gateway's MAC, not the final destination's MAC.

A00:11:11:11:11

00:11:11:11:11 is Client A's own source MAC address - a device never uses its own MAC as the destination.

Bf1: f1:f1:f1:f1

f1:f1:f1:f1:f1 does not correspond to any device in this topology and is not a valid destination for this scenario.

C00:33:33:33:33Correct

Because Client B (10.10.10.0/24) is on a different subnet than Client A (192.168.x.x/24), Client A cannot deliver the frame directly. Client A sends the Ethernet frame with the destination MAC of its default gateway (00:33:33:33:33) so the router can receive and forward it. The IP destination header still contains Client B's IP address, but the Layer 2 destination MAC is always the next-hop device on the local segment.

D00:22:22:22:22

00:22:22:22:22 is Client B's MAC, but Client A has no direct Layer 2 path to Client B since they are on different subnets - ARP on Client A's segment would not resolve Client B's MAC.

Concept tested: Layer 2 MAC addressing for inter-subnet routing

Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/tcpip-addressing-and-subnetting

Topics

#MAC address#default gateway#ARP#Layer 2 forwarding

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