311015040计算机网络_A,311015040计算机网络_A

1. Multiple Choice (30 points, 1.5 points for each question)

(1). Which of the following protocols is NOT an application protocol ? _________

A. FTP

B.HTTP

C.ARP

D.DHCP

(2). Among the following applications, which one is not suitable for P2P architecture ?

___

A. ?le sharing

B. electronic banking

C. video streaming

D. instant message

(3). The transfer of an Web document from one host to another is:

A. loss-intolerant and time insensitive

B. loss-tolerant and time sensitive

C. loss-intolerant and time sensitive

D. none of the above

(4). Suppose a browser sends an HTTP request message with the If-modified-since:

header. Suppose the object in a server has not changed since the last time a client retrieved the object. Then the server will send a response message with the status code:

A 404 Not Found

B 304 Not Modified

C 200 OK

D None of the above

(5). In modern packet-switched networks, the source host splits long, application-layer

packets (for example, an image or a music file) into smaller packets and sends the packets into the network. This technic is called _________

A. route aggregation

B. IP fragmentation

C. IP reassemblysegment datagram

D. message segmentation

(6). If a segment carries data along with an acknowledgment, this is called _______.

A. backpacking

B. piggybacking

C. out-of-band

D. piggy packing

(7). UDP offers which of the following benefits relative to TCP?

A. UDP consumes fewer computer resources by not maintaining connection state

B. UDP supports a self-regulating “throttle” feature that prevents network saturation

C. UDP guarantee s that Individual packets of a transmission will arrive “in order”

D. None of the above

(8). In TCP, the timeout interval is a function of ______:

A. estimated RTT at the sender

B. MSS and the overhead of a

segment

C. the size of buffer at the receiver

D. the size of sending window

(9). How many bits are there in IP v6 ? _________

A. 32

B. 64

C. 128

D. 256

(10). In CIDR notation, which of the following networks contains host 192.168.14.2?

A. 192.168.10.0/22

B. 192.168.11.0/21

C. 192.168.12.0/23

D. 192.168.13.0/24

(11). Which of the following protocol belongs to intra-AS routing protocol? _________

A. RIP

B. BGP

C. DV (Distance Vector)

D. LS (Link State)

(12). IP is a _________ protocol.

A. connection-oriented unreliable

B. connection-oriented reliable

C. connectionless unreliable

D. connectionless reliable