CS 2705 Mod 5 Transport Layer

21

FTP

T/F The checksum field can optionally be left blank (all 0's) when using TCP.

False

T/F The server process typically uses an ephemeral port.

False

80

HTTP

443

HTTPS

A socket address is a combination of

IP address and Port

17

QUOTD

25

SMTP

22

SSH

The typical TCP connection establishment process is represented by which of the following control packet sequences.

SYN -> SYN+AKC -> ACK

Which ackowledgement system allows a receiver to acknowledge segments out of order?

Selective acknowledgements

Which fields are part of the TCP header?

Source port Destination port Acknowledgement Number Sequence Number Checksum

Which fields are part of the UDP header?

Source port Destination port Length Checksum

Match the port ranges to the IANA designation.

0-1023 [ Choose ] Well-known ports 1024-49151 [ Choose ] Registered ports 49152-65535 [ Choose ] Dynamic/private ports

Which acknowledgement system allows a receiver to acknowledge all previous segments with a single number.

Cumulative acknowledgements

67

DHCP

53

DNS

Match the port number to corresponding application. 7

ECHO

T/F The client process typically uses an ephemeral port.

True

T/F, The checksum field can optionally be left blank (all 0's) when using UDP.

True

Which of the following characteristics apply to the UDP protocol?

Unreliable, Message-Oriented, Connectionless

The sender uses ____________ to know when to retransmit a segment

a retransmission timer

TCP uses __________ to communicate back to the sender which segments have been received.

acknowledgement numbers

Which of the following does TCP do?

establish connections guarantee delivery use ports to match processes to sockets detect lost packets handle congestion transfer message to/from the network layer keep packets in correct order

TCP Sequence numbers are used to

keep segments in order track missing segments detect missing segments

Which scenarios would be most appropriate for using the TCP protocol?

large file transfers protocols requiring many requests and responses

Which scenarios would be most appropriate for using the UDP protocol?

live-streams without buffering protocols using multicasting simple single request and response protocols

Which of the following characteristics apply to the TCP protocol?

reliable, byte-oriented, stream-oriented, and connection-oriented

23

telnet

When two processes are communicating using TCP or UDP, the communication can be uniquely identified using

the two socket addresses

Which of the following does UDP do?

use ports to match processes to sockets and transfer message to/from the network layer

123

NTP