Which two statements about proxy ARP are true? (Choose two.)
A.
It is supported on networks without ARP.
B.
It allows machines to spoof packets.
C.
It requires larger ARP tables
D.
It reduces the amount of ARP traffic.
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Disadvantages of Proxy ARP
Hosts have no idea of the physical details of their network and assume it to be a flat network in
which they can reach any destination simply by sending an ARP request. But using ARP for
everything has disadvantages. These are some of the disadvantages:
Reference. http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocationresolution/
13718-5.html
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Disadvantages of Proxy ARP
Hosts have no idea of the physical details of their network and assume it to be a flat network in which they can reach any destination simply by sending an ARP request. But using ARP for everything has disadvantages. These are some of the disadvantages:
-It increases the amount of ARP traffic on your segment.
-Hosts need larger ARP tables in order to handle IP-to-MAC address mappings.
-Security can be undermined. A machine can claim to be another in order to intercept packets, an act called “spoofing.”
-It does not work for networks that do not use ARP for address resolution.
-It does not generalize to all network topologies. For example, more than one router that connects two physical networks.
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