Frame. Relay is simplified form. of(71), similar in principle to(72), in which synchronous, frames of data are routed to different destinations depending on header information . Packets are routed throught one or more Virtual Circuits known as(73). Most V

●SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment ．A varietion of the (71) protocol called NRM is essentially the same as SDLC．SDLC is (72) protocol like HDLC , Frame. Relay or X．25．An SDLC network is made up of (73) that controls all communications , and (74) ．It is capable of (75) operation, but almost all practical applications are strictly half duplex．

(71) A．HDLC

B．Frame. Relay

C．X．25

D．X．21

(72) A．a peer to peer

B．a point-to-point

C．not a peer to peer

D．a peer to peers

(73) A．a primary station

B．one or more primary stations

C．a secondary station

D．one or more secondary stations

(74) A．a primary station

B．one or more primary stations

C．a secondary station

D．one or more secondary stations

(75) A．half duplex

B．full duplex

C．half or full duplex

D．half and full duplex

● (71) In the strength of the carrier signal is varied to represent binary 1 or 0．

(72) is a system that can map a name to an address and conversely an address to an name．

(73) is a three-way handshaking authentication protocol that it's packets are encapsulated in the point-to-point protocol

(74) is an approach that enables an ATM Switch to behave like a LAN switch．

(75) is an guided media which is made of glass or plastic and transmits signals in the form. of light．

(71) A．ASK

B．PSK

C．FSK

D．FDM

(72) A．NAT

B．NCP

C．DDN

D．DNS

(73) A．PPP

B．PAP

C．CHAP

D．LCP

(74) A．VLAN

B．LANE

C．VPN

D．IPOA

(75) A．Coaxial cable

B．Optical fiber

C．Unshielded Twisted-pair Cable

D．Shielded Twisted-pair Cable

Frame. Relay is simplified form. of(71), similar in principle to(72), in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as(73)Most Virtual Circuits are(74), which means that the network provider sets up all DLCI connections at subscription time.(75)are also part of the Frame. Relay specification. They privide a link that only lasts only as long as the session.

A．Datagram Switching

B．Datagram Routing

C．Packet Switchig

D．packet Routing

A Ezonexam Ethernet switch receives a unicast frame. with a destination MAC that is listed in the switch table. What will this switch do with the frame?

A. The switch will forward the frame. to a specific port

B. The switch will forward the frame. to all ports except the port on which it was received

C. The switch will return a copy of the frame. out the source port

D. The switch will not forward unicast frames

E. The switch will remove the destination MAC from the switch table

F. None of the above.

A. set dhcp relay 1.1.1.1 set dhcp relay 2.2.2.2 set dhcp relay

B. set dhcp relay proxy set dhcp relay 1.1.1.1 set dhcp relay 2.2.2.2

C. set dhcp relay 1.1.1.1 proxy set dhcp relay 2.2.2.2

D. set dhcp relay 1.1.1.1 set dhcp relay 2.2.2.2 proxy

The(71) program is generally translated to an object program, which is in a form. directly understandably by the computer。

A．transfer

B．assemble

C．source

D．compile

● The usual way to ensure reliable delivery is to provide the （71） with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special （72） frame. bearing positive or negative （73） about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the frame. has arrived safely. On the other hand, a negative acknowledgement means that something has gone wrong, and the frame. must be transmitted again. An additional complication comes from the possibility that hardware troubles may cause a

frame. to （74） completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame. and then waits for an acknowledgement, positive or negative, will hang forever if a frame. is ever lost due to, for example, （75） hardware.

（71）

A. receiver

B. controller

C. sender

D. customer

（72）

A. data

B. control

C. request

D. session

（73）

A. application

B. connection

C. stream

D. acknowledgement

（74）

A. vanish

B. vary

C. appear

D. incline

（75）

A. acting

B. working

C. malfunctioning

D. functioning

Object-oriented analysis(OOA)is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is(71). It determines how the various results are computed by the product and presents this information in the form. of a(72)and associated scenarios. The second is(73), which determines the classes and their attributes. Then determine the interrelationships and interaction among the classes. The last step is(74), which determines the actions performed by or to each class or subclass and presents this information in the form. of(75).

A．use-case modeling

B．class modeling

C．dynamic modeling

D．behavioral modeling

试题（71）～（75）Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is （71）. It determines how the various results are computed by the product and presents this information in the form. of a （72） and associated scenarios. The second is （73） , which determines the classes and their attributes. Then determine the interrelationships and interaction among the classes. The last step is （74） , which determines the actions performed by or to each class or subclass and presents this information in the form. of （75） .

（71）

A. use-case modeling

B. class modeling

C. dynamic modeling

D. behavioral modeling

（72）

A. collaboration diagram

B. sequence diagram

C. use-case diagram

D. activity diagram

（73）

A. use-case modeling

B. class modeling

C. dynamic modeling

D. behavioral modeling

（74）

A. use-case modeling

B. class modeling

C. dynamic modeling

D. behavioral modeling（75）

A. activity diagram

B. component diagram

C. sequence diagram

D. state diagram

●Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is （71）. It determines how the various results are computed by the product and presents this information in the form. of a （72） and associated scenarios. The second is （73） , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is （74） , which determines the actions performed by or to each class or subclass and presents this information in the form. of （75） .

（71）

A.use-case modeling

B. class modeling

C. dynamic modeling

D. behavioral modeling

（72）

A. collaboration diagram

B. sequence diagram

C. use-case diagram

D. activity diagram

（73）

A. use-case modeling

B. class modeling

C. dynamic modeling

D. behavioral modeling

（74）

A.use-case modeling

B. class modeling

C. dynamic modeling

D. behavioral modeling

（75）

A. activity diagram

B. component diagram

C. sequence diagram

D. state diagram

SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment . A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame. Relay or X.25. An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

A．HDLC

B．Frame. Relay

C．X.25

D．X.21

Frame. Relay is simplified form. of(66), similar in principle to(67), in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as(68). Most Virtual Circuits are(69), which means that the network provider sets up all DLCI connections at subscription time.(70)are also part of the Frame. Relay specification. They privide a link that only lasts only as long as the session.

A．Datagram Switching

B．Datagram Routing

C．Packet Switching

D．packet Routing

A. frame-relay arp

B. frame-relay map

C. frame-relay interface-dlci

D. frame-relay lmi-type

The usual way to ensure reliable delivery is to provide the (71) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (72) flame bearing positive or negative (73) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the frame. has arrived safely. On the other hand, a negative acknowledgement means that' something has gone wrong, and the frame. must be transmitted again.

An additional complication comes from the possibility that hardware troubles may cause a flame to (74) completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame. and then waits for an acknowledgement, positive or negative, will hang forever if a frame. is ever lost due to, for example, (75) hardware.

A．receiver

B．controller

C．sender

D．customer