What is the purpose of ARP in Layer 3 forwarding?

To assign IP addresses to devices on a network

To resolve a next-hop IP address to a MAC address

To translate private IP addresses to public IP addresses

To determine the best path to a destination network

A router receives a frame on interface Gig0/0. The destination MAC of the frame is the router's own MAC address. The router strips the Layer 2 header and examines the IP packet. What is the next step in the forwarding process?

Rewrite the source MAC address and forward the frame

Decrement the TTL and forward the packet out the same interface

Perform a routing table lookup on the destination IP address

Send an ARP request for the destination IP address

In the forwarding decision process, what happens immediately after the router determines the next-hop IP address?

It resolves the next-hop IP to a MAC address using ARP

It forwards the packet to the default gateway

It rewrites the source IP address

Why does a router rewrite the destination MAC address when forwarding a packet?

Because the router must hide the original sender's MAC address

Because the frame is encrypted at each hop

Because the IP address of the destination changes at each hop

Because the frame must be addressed to the next hop's MAC address

A router receives a 1600-byte IP packet (including the 20-byte IP header) on a high-speed interface and needs to forward it out an interface with an MTU of 1500 bytes. The DF bit is set in the IP header. What will the router do?

Drop the packet and send an ICMP Fragmentation Needed message to the source

Strip the DF bit and fragment the packet

Fragment the packet into two fragments that fit the MTU

Forward the packet unchanged because the ingress interface supports a larger MTU

Dell Networking Foundations

Domain 3Objective 4

Explain the Forwarding Logic Used by Layer 3 Capable Devices NETWORKING-FOUNDATIONS Practice Questions (Page 5)

Part of the IP Networking domain, which accounts for 25% of the NETWORKING-FOUNDATIONS exam.

27questions here

6free pages

9concepts

25%of the exam

Questions 21–25

21foundation · easy
What is the purpose of ARP in Layer 3 forwarding?
Select an answer first
22application · medium
A router receives a frame on interface Gig0/0. The destination MAC of the frame is the router's own MAC address. The router strips the Layer 2 header and examines the IP packet. What is the next step in the forwarding process?
Select an answer first
23foundation · easy
In the forwarding decision process, what happens immediately after the router determines the next-hop IP address?
Select an answer first
24foundation · easy
Why does a router rewrite the destination MAC address when forwarding a packet?
Select an answer first
25application · medium
A router receives a 1600-byte IP packet (including the 20-byte IP header) on a high-speed interface and needs to forward it out an interface with an MTU of 1500 bytes. The DF bit is set in the IP header. What will the router do?
Select an answer first

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