TCP/IP(71)layer protocols provide services to the application(72)running on a computer. Th

第1题

● TCP／IP （71） layer protocols provide services to the application （72） running on a comput

● TCP/IP （71） layer protocols provide services to the application （72） running on a computer. The application layer does not define the application itself, but rather it defines （73） that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an （74） between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP （75） layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

● TCP／IP （71） layer protocols provide services to

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第2题

● A glue that holds the whole Internet together is the network layer protocol,（71). Unlike

● A glue that holds the whole Internet together is the network layer protocol,(71). Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind. Its job is to provide a -(72) way to transport datagrams from source to destination, without regard to whether these machines are on the same network or whether there are other networks in between them.

Communication in the Internet works as follows. The (73)layer takes data streams and breaks them up into datagrams. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. When all the pieces finally get to the destination machine, they are reassembled by the

(74) layer into the original datagram. This datagram is then handed to the transport layer, which inserts it into the receiving process' input stream.

An IP datagram consists of a header part and a text part. The header has a (75) part and a variable length optional part.

(71) A. IP (Internet Protocol)

B. IP (Interworking Protocol)

C. TCP (Transport Control Protocol)

D. TCP (Transfer Communication Protocol)

(72) A. best-quality

B. quality-guaranteed

C. connection-oriented

D. best-efforts

(73) A. data link

B. transport

C. network

D. application

(74) A. data link

B. transport

C. network

D. application

(75) A. 40-byte fixed

B. 64-byte fixed

C. 20~64 bytes variable

D. 20-byte fixed

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第3题

Each machine supporting TCP has a TCP transport entity, either a library procedure, a user

process, or part of the kernel. In all case, it manages TCP streams and (71) to the IP layer. A TCP (72) accepts user data streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP (73). When datagrams containing TCP data arrive at a machine, they are given to the TCP entity, which reconstructs the original byte streams.The IP layer gives no guarantee that datagrams will be delivered properly, so it is up to TCP to time out and (74) them as need be. Datagmms do arrive may well do so in the wrong order, it is also up to TCP to (75) them into messages in the proper sequence.

A．calls

B．interfaces

C．links

D．produces

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第4题

A transport layer protocol has several responsibilities. One is to create a process-to-pro

cess (program-to-program) communication; TCP uses port (71) to accomplish this. Another responsibility of a transport layer protocol is to create a (72) and error-control mechanism at the transport level. TCP uses a sliding (73) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (74) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (75) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

（71）

A．numbers

B．connections

C．diagrams

D．resources

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第5题

Access to non-peer layer is available in TCP/IP model, e.g. data link layer can access

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第6题

TCP means it is on the（74)layer and IP means it is on the（75)layer.A．networkB．transportC．d

TCP means it is on the(74)layer and IP means it is on the(75)layer.

A．network

B．transport

C．data link

D．application

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第7题

● A transport layer protocol has several responsibilities. One is to create a process-to-p

rocess (program-to-program) communication; TCP uses port （71） to accomplish this. Another responsibility of a transport layer protocol is to create a （72） and error-control mechanism at the transport level. TCP uses a sliding （73） protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （74） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （75） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

（71）

A. numbers

B. connections

C. diagrams

D. resources

（72）

A. procedure

B. function

C. route

D. flow

（73）

A. path

B. window

C. frame

D. diagram

（74）

A. packet

B. time

C. error

D. phase

（75）

A. ports

B. streams

C. packets

D. cells

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第8题

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

TCP functions at the Open System Interconnection(OSI)(61)layer, or Layer 4. Its chief responsibility is to ensure(62)end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each(63)sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3(64). This information, combined with routing tables and other network intelligence, is all it takes to get(65)the room or around the world via TCP/IP.

A．transpose

B．translate

C．transmit

D．transport

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第9题

TCP/IP在多个层次中引入了安全机制，其中SSL（Security Socket Layer)协议位于（8)。A．数据链路层B．

TCP/IP在多个层次中引入了安全机制，其中SSL(Security Socket Layer)协议位于(8)。

A．数据链路层

B．网络层

C．传输层

D．应用层

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第10题

● TCP/IP 在多个层次中引入了安全机制，其中 SSL（Security Socket Layer)协议位于（8）。（8）A. 数

● TCP/IP 在多个层次中引入了安全机制，其中 SSL(Security Socket Layer)协议位于（8）。

（8）

A. 数据链路层

B. 网络层

C. 传输层

D. 应用层

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TCP/IP（71)layer protocols provide services to the application（72)running on a computer. Th