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| Question ID 18535 | Which two statements about proxy ARP are true? (Choose two.)
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| Option A | It is supported on networks without ARP.
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| Option B | It allows machines to spoof packets.
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| Option C | It must be used on a network with the host on a different subnet.
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| Option D | It requires larger ARP tables.
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| Option E | It reduces the amount of ARP traffic.
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| Correct Answer | B,D |
Explanation Explanation: 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. Reference: http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation- resolution/13718-5.html
| Question ID 18536 | Refer to the exhibit.
 ICMP Echo requests from host A are not reaching the intended destination on host B. What
is the problem?
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| Option A | The ICMP payload is malformed.
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| Option B | The ICMP Identifier (BE) is invalid.
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| Option C | The negotiation of the connection failed.
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| Option D | The packet is dropped at the next hop.
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| Option E | The link is congested.
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| Correct Answer | D |
Explanation Explanation: Here we see that the Time to Live (TTL) value of the packet is one, so it will be forwarded to the next hop router, but then dropped because the TTL value will be 0 at the next hop.