ARP协议是“Address Resolution Protocol”的缩写，即（）协议。

地址解析协议(Address Resolution Protocol，ARP)可以实现IP 地址映射成为物理地址()

A.Network Interface Layer

B.Internetwork Layer

C.Host-to-Host Transport Layer

D.Application Layer

A. Provides local hosts with a default gateway address

B. Allows remote management of the switch.

C. Allows the switch to respond to ARP requests between two hosts

D. Ensures that hosts on the same LAN can communicate with each other.

A.同一线路上划分不同的通道

B.将域名解析为IP

C.通过MAC地址找到具体设备

D.通过IP地址找到具体设备

A．To provide local hosts with a default gateway address

B．To allow remote management of the switch.

C．To allow the switch to respond to ARP requests between two hosts

D．To ensure that hosts on the same LAN can communicate with each other.

E．None of the above

A. Inspect the routing table to select the best path to the destination network addresses.

B. Validate sources of routing information.

C. Inspect the ARP table to verify a legitimate source MAC address for each packet.

D. Identify the destination network address of each packet.

E. Verify the receipt of routed packets by the next hop router.

F. Identify the source network address of each packet.

TCP functions at the Open Systems Interconnection(OSI)transport layer, or Layer 4. Its chief responsibility is to ensure reliable end-to-end connectivity. IP, located one layer （1）, at the OSI network layer, or Layer 3,communicates the addresses of each packet’s sender and receiver to the routers along the way .Routers and Layer 3 switches can read IP and other Layer 3 protocols. This information, combined with routing tables and other network intelligence, it takes to get across the room or around the world（2）TCP/IP.

The routing process begins with an IP address that is（3）to the sending end station. End stations may be assigned permanent IP addresses or they may borrow them as needed from a Dynamic Host Configuration Protocol(DHCP)server or other service. If the sending end station determines that the destination address is not local, the packet goes to a first-hop router, typically one that is close and has been reassigned to the（4）. The router inspects the packet’s IP address and performs a route table lookup to see if the destination end station resides on the local(physically connected)network, typically called an IP subnet. An IP subnet usually is assigned to each of the router’s network interfaces. If the destination IP address is local, the router searches an internal store of IP addresses and local-device media access control(MAC)addresses. This store is known as the Address Resolution Protocol(ARP) cache. ARP is the universal tool for（5）IP addresses to MAC addresses. If the destination’s MAC address appears, the router installs that MAC address in the packet header(removing its own MAC address because that’s no longer needed)and sends the packet to the destination end station.

（1）A. up

B. down

C. sideward

D. back-fence

（2）A. via

B. through

C. by

D. through out

（3）A. special

B. especial

C. unique

D. particular

（4）A. accepter

B. sender

C. router

D. server

（5）A. searching

B. looking

C. locating

D. matching

GIBBER : SENSE ::

A．jabber : noise

B．toddle : mobility

C．dawdle :deference

D．vacillate : resolution

E．disobey : order