9.2.10 Check Your Understanding – ARP Answers

1. What two functions are provided by ARP? (Choose two.)

  • Maintains a table of IPv4 address to domain names
  • Maintains a table of IPv4 to MAC address mappings
  • Maintains a table of IPv6 to MAC address mappings
  • Resolves IPv4 addresses to domain names
  • Resolves IPv4 addresses to MAC addresses
  • Resolves IPv6 addresses to MAC addresses

Explanation: ARP has two primary functions: maintain a table of IPv4 to MAC address mappings and determine the MAC addresses of known IPv4 addresses.

2. Where is the ARP table stored on a device?

  • ROM
  • flash
  • NVRAM
  • RAM

Explanation: The ARP table is cached temporarily in RAM.

3. Which statement is true about ARP?

  • An ARP cache cannot be manually deleted.
  • ARP entries are cached permanently.
  • ARP entries are cached temporarily.

Explanation: The ARP table is cached temporarily in RAM.

4. Which command could be used on a Cisco router to view its ARP table?

  • arp -a
  • arp -d
  • show arp table
  • show ip arp

Explanation: The command show ip arp is used on Cisco routers to view the ARP table.

5. What is an attack using ARP?

  • ARP broadcasts
  • ARP hopping attacks
  • ARP poisoning
  • ARP starvation

Explanation: Two security issues with ARP Requests are that ARP messages are sent as broadcasts and can be spoofed.

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