TCP functions at the Open System Interconnection（OSI)（61)layer, or Layer 4. Its chief resp

The de facto standard Application Program Interface (API) for TCP/IP applications is the “sockets” interface. Although this API was developed for （71） in the early 1960s it has also been implemented on a wide variety of no-Unix systems. TCP/IP （72） Written using the sockets API have in the past enjoyed a high degree of portability and we would like the same （73） with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 （74） ,new address conversion functions, and some new socket options. These extensions are designed to provide access to the basic IPv6 features requited by TCP and UDP applications, including multicasting, while introducing a minimums of change into the system and providing complete （75） for existing IPv4 applications.

A.Windows

B.Linux

C.Unix

D.DOS

“sockets” interface. Although this API was developed for __（71）__ in the early 1980s it has also been implemented on a wide variety of non-Unix systems。 TCP/IP __（72）__ written using the sockets API have in the past enjoyed a high degree of portability and we would like the same __（73）__ with IPv6 applications。 But changes are required to the sockets API to support IPv6 and this memo describes these changes。These include a new socket address structure to carry IPv6 __（74）__，new address conversion functions，and some new socket options。These extensions are designed to provide access to the basic IPv6 features required by TCP and UDP applications，including multicasting， while introducing a minimum of change into the system and providing complete __（75）__ for existing IPv4 applications。

A.Windows

B.Linux

C.Unix

D.DOS

ckets” interface. Although this API was developed for __（71）__ in the early 1980s it has also been implemented on a wide variety ofnon-Unix systems。 TCP/IP __（72）__ written using the sockets API have in the past enjoyed a high degreeof portability and we would like the same __（73）__ with IPv6 applications。 But changes are requiredto the sockets API to support IPv6 and this memo describes these changes。These include a new socket address structure to carry IPv6 __（74）__，new address conversion functions，and some new socket options。These extensions aredesigned to provide access to the basic IPv6 features required by TCP and UDPapplications，including multicasting， while introducing aminimum of change into the system and providing complete __（75）__ for existing IPv4 applications。

A.Windows

B.Linux

C.Unix

D.DOS@@@SXB@@@A.applications

B.networks

C.protocols

D.systems@@@SXB@@@A.portability

B.availability

C.capability

D.reliability@@@SXB@@@A.connections

B.protocols

C.networks

D.addresses@@@SXB@@@A.availability

B.compatibility

C.capability

D.reliability

ns as a print server on the network. Testking1 contains a single printer named SalesPrinter12.Several users submit large print jobs to SalesPrinter12. A user reports that the print jobs fails to complete. You examine the print queue on SalesPrinter12, and you discover that one of the print jobs is showing an error. You attempt to delete the job, but you are unsuccessful.You need to ensure that print jobs submitted to SalesPrinter12 complete successfully.What should you do？（）

A. Configure SalesPrinter12 to use a TCP/IP port.

B. Increase the priority of SalesPrinter12.

C. Delete all files from the C:\Windows\System32\Spool folder.

D. Restart the spooler service on Testking1.

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

A) performances

B) operations

C) functions

D) workings:

A.activities

B.workflows

C.transitions

D.functions

［A］applications ［B］enterprises ［C］functions ［D］performances