Chapter 3 Transport Layer
1. A transport-layer protocol provides for logical communication between ____.
A Application process
B Hosts
C Routers
D End systems
2. Transport-layer protocols run in ____.
A Servers
B Clients
C Routers
ret什么意思Dchief End systems
3. In transport layer, the nd side breaks application messages into ____, pass to network layer.
A Frames
B Segments
C Data-grams
D bit streams
4. Services provided by transport layer include ____.
A HTTP and FTP怎么学日语
B TCP and IP
C TCP and UDP
D SMTP
5. Which of the following rvices is not provided by TCP?
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A Delay guarantees and bandwidth guarantees
B Reliable data transfers and flow controls
C Congestion controls
D In-order data transfers
6. The two minimal transport-layer rvices----____ and ____----are the only two rvices that UDP provides!
A process-to-process data delivery, error checking
B congestion control, reliable data transfer
C flow control, congestion control
D exchange rate In-order data transfer, error checking
7. Port number’s scope is ____ to ____.
A 0, 1023
B 0, 65535
C 0, 127
D 0,255
8. The port numbers ranging from ____to ____ are called well-known port number and are restricted.
A 0, 1023
B 0, 65535
C 0, 127
D 0,255
9. UDP socket identified by two components, they are ____.
A source IP address and source port numbers
B source IP address and destination IP address
C destination IP address and destination port numbers
D destination port numbers and source port numbers
10. TCP socket identified by a (an) ____.
A 1-tuple
B 2-tuple
C 3-tuple
D 4-tuple
11. Which of the following applications normally us UDP rvices?
A SMTP全日制英语
B Streaming multimedia
C FTP
D HTTP
12. Reliable data transfer protocol over a perfectly reliable channel is____.
A rdt1.0 B rdt2.0 C rdt3.0 D rdt2.1
13. Reliable data transfer protocol over a channel with bit errors and packet loss is ____. mym
A rdt1.0 B rdt2.0 C rdt3.0 D rdt2.1
14. Which of the following about reliable data transfer over a channel with bit errors is not correct?
A RDT2.0: assuming ACK and NAK will not be corrupted
B RDT2.1: assuming ACK and NAK can be corrupted
C RDT2.2: only u ACK-s
D RDT2.2: u both ACK-s and NAK-s
15. Which of the following protocols is not pipelining protocols?
A TCP B rdt3.0
C GO-BACK-N D lective repeat
16. Which of the following is not correct about GBN protocol?
A Only using ACK-s
B Using cumulative ACK-s
C Receiver discards all out-of-order packets
D It is not pipelined protocol
17. Which of the following is not correct about SR protocol?
A receiver individually acknowledges all correctly received packets
B nder only rends packets for which ACK not received
C It limits quence number of nt but un-ACK-ed packets
D It is not a pipelined protocol
18. Which of the following about TCP connection is not correct?
A It is a broadcast connection
B It is a point-to-point connection
C It is a pipelined connection
D It is a full duplex connection
19. The SYN gment is ud for____.
A TCP connection tup
B TCP flow control
C TCP congestion control
D Closing a TCP connection
20. The FIN gment is ud for____.
A TCP connection tup
百思B TCP flow control
C TCP congestion control
D嫩芽是什么意思 Closing a TCP connection
21.How does TCP nder perceive congestion?
A Through a timeout event
B Through a receiving duplicate ACK-s event
C Both A and B
D Either A or B
22. Extending host-to-host delivery to process-to-process delivery is called transport-layer ____ and .
A multiplexing and de-multiplexing
B storing and forwarding
C forwarding and filtering
D switching and routing
23. UDP is a ____ rvice while TCP is a connection-oriented rvice.
A Connectionless
B Reliable
C Connection-oriented
D In-order
24. The UDP header has only four fields, they are____.
A Source port number, destination port number, length and checksum
B Source port number, destination port number, source IP and destination IP
C source IP, destination IP, source MAC address and destination MAC address
D source IP, destination IP, quence number and ACK quence number
25. There are two 16-bit integers: 1110 0110 0110 0110, 1101 0101 0101 0101. Their checksum is____.
