题目内容（请给出正确答案）

[单选题]

A router that takes the workstations internal IP address and changes it to another IP address whenit sends the data outside of the network is an example of which of the following？（）

A.NAT

B.IDS

C.NMAP

D.DMZ

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更多“A router that takes the workst…”相关的问题

第1题

Brandy is a Linux administrator.She learns from a user that it takes unusually long ti

A.Tracert

B.Router

C.Ifconfig

D.Chmod

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第2题

● （71) is a one-way function that takes an arbitrarily long piece of plaintext and from it

● (71) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string．

(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection．

(73) is an approach preferred by cable TV providers ．In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable．

(74) is a device used to connect two separate network that use different communication protocol．

(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative．

(71) A． MD

B．RSA

C．DES

D．MIB

(72)A．RTP

B．RTTPC FTP

D．NNTP

(73) A． ADSL

B．FTTC

C．HFC

D．FTTH

(74)A ．Router

B．Gateway

C．Bridge

D．hub

(75)A ．NNI

B．NRZ

C．NAK

D．NVT

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第3题

One of the most widely used routing protocols in IP networks is the Routing Information Pr

otocol(RIP)．RIP is the canonical example of a routing protocol built on the (71) algorithm．Routing protocols in internetworks differ slightly from the idealized graph model．In aninternetwork，the goal of the routers to forward packets to various (72) ．

Routers running RIP send their advertisement about cost every (73) seconds．A router also sends an update message whenever an update from another router causes it to change itsrouting table．

It is possible to use a range of different metrics or costs for the links in a routing protocol．RIP takes the simplest approach，with all link costs being equal (74) Thus it always tries tofind the minimum hop route．Valid distances are 1 through (75) ．This also limits RIP torunning on fairly small networks．

（71）

A．distance vector

B．link state

C．flooding

D．minimum spanning tree

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第4题

● One of the most widely used routing protocols in IP networks is the Routing Information

Protocol (RIP). RIP is the canonical example of a routing protocol built on the （71）algorithm. Routing protocols in internetworks differ slightly from the idealized graph model. In an internetwork, the goal of the routers to forward packets to various （72）.

Routers running RIP send their advertisement about cost every （73） seconds. A router also sends an update message whenever an update from another router causes it to change its routing table.

It is possible to use a range of different metrics or costs for the links in a routing protocol. RIP takes the simplest approach, with all link costs being equal （74）. Thus it always tries to find the minimum hop route. Valid distances are 1 through （75）.This also limits RIP to running on fairly small networks.

（71）

A. distance vector

B. link state

C. flooding

D. minimum spanning tree

（72）

A. computers

B. routers

C. switches

D. networks

（73）

A. 10

B. 30

C. 60

D. 180

（74）

A. 1

B. 15

C. 16

D. length of the link

（75）

A. 6

B. 10

C. 15

D. 16

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第5题

TCP functions at the Open Systems Interconnection（OSI)transport layer, or Layer 4. Its chi

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