2. 计算机
  3. The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has be

The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has be

admin2009-05-19  36
问题 The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? (Choose two)
选项 A、ARP
B、CDP
C、DHCP
D、DNS
E、ICMP
答案A,E
解析 Explanation:
ARP finds the hardware address of a host from a known IP address. Here’s how it works: when IP has a datagram to send, it must inform a Network Access protocol, such as Ethernet or Token Ring, of the destination’s hardware address on the local network. (It has already been informed by upper-layer protocols of the destination’s IP address.) If IP doesn’t find the destination host’s hardware address in the ARP cache, it uses ARP to find this information.

ICMP works at the Network layer and is used by IP for many different services. ICMP is a management protocol and messaging service provider for IP. Its messages are carried as IP datagrams. RFC 1256 is an annex to ICMP, which affords hosts’ extended capability in discovering routes to gateways. Periodically, router advertisements are announced over the network, reporting IP addresses for the router’s network interfaces. Hosts listen for these network infomercials to acquire route information. A router solicitation is a request for immediate advertisements and may be sent by a host when it starts up.
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