ARP

Question 1

Protocol Type for IPv4

Answer 1

0x0800

Question 2

EtherType (hexadecimal), 0x0800

Answer 2

IPv4

Question 3

EtherType (hexadecimal), 0x0806

Answer 3

ARP

Question 4

EtherType (hexadecimal), 0x0842

Answer 4

Wake-on-LAN

Question 5

EtherType (hexadecimal), 0x22F0

Answer 5

Audio Video Transport Protocol (AVTP)

Question 6

ARPA

Answer 6

Ethernet II, the ethernet type used by Cisco devices
long term incomplete ARP entries are from connections to non-existing IP addresses and are flushed in 1 minute instead of 4 hours

Question 7

RFC 1027

Answer 7

Proxy ARP - allows for multiple IP’s on one interface, used for dial up to respond for a slwo or intermittantly responding host, It is enabled by default in Cisco IOS.

Question 8

ip local-proxy-arp

Answer 8

When this command is enabled, the router can respond to ARP requests on behalf of hosts on the local network, even if they belong to different subnets. This allows devices to communicate directly without needing to configure additional routes. It’s often used in situations like shared networks or for simplifying network configurations. (in a test they could turn off proxy arp on an interface to break traffic)

Question 9

HSRP vs VRRP

Answer 9

In summary, HSRP is Cisco-specific while VRRP is a standardized protocol with slightly faster failover by default.