Day 30 Flashcards - TCP & UDP

FTP data = TCP port […]

20

[…] = TCP port 20

FTP data

FTP data = […] port 20

TCP

[…] = TCP port 21

FTP control

FTP control = […] port 21

TCP

FTP control = TCP port […]

21

[…] = TCP port 22

SSH

SSH = […] port 22

TCP

SSH = TCP port […]

22

[…] = TCP port 23

Telnet

Telnet = TCP port […]

23

[…] = TCP port 25

SMTP

SMTP = […] port 25

TCP

SMTP = TCP port […]

25

[…] = TCP port 80

HTTP

HTTP = […] port 80

TCP

HTTP = TCP port […]

80

[…] = TCP port 110

POP3

POP3 = […] port 110

TCP

POP3 = TCP port […]

110

[…] = TCP port 443

HTTPS

HTTPS = […] port 443

TCP

HTTPS = TCP port […]

443

[…] = UDP port 67

DHCP server

DHCP server = […] port 67

UDP

DHCP server = UDP port […]

67

[…] = UDP port 68

DHCP client

DHCP client = UDP port […]

68

DHCP client = […] port 68

UDP

[…] = UDP port 69

TFTP

TFTP = […] port 69

UDP

TFTP = UDP port […]

69

[…] = UDP port 161

SNMP agent

SNMP agent = […] port 161

UDP

SNMP agent = UDP port […]

161

[…] = UDP port 162

SNMP manager

SNMP manager = […] port 162

UDP

SNMP manager = UDP port […]

162

[…] = UDP port 514

Syslog

Syslog = […] port 514

UDP

Syslog = UDP port […]

514

[…] = TCP/UDP port 53

DNS

DNS = […] port 53

TCP/UDP

DNS = TCP/UDP port […]

53

Telnet = […] port 23

TCP

What does TCP stand for?

Transmission Control Protocol

What does UDP stand for?

User Datagram Protocol

What are Layer 4 addresses?

Port numbers

[TCP/UDP] provides reliable data transfer.

TCP

[TCP/UDP] provides error recovery.

TCP

[TCP/UDP] provides data sequencing.

TCP

[TCP/UDP] provides flow control.

TCP

[TCP/UDP] has less overhead.

UDP

The Layer 4 destination port number indicates the […] Layer protocol.

Application

The Layer 4 [source/destination] port number is randomly selected by the host that initiates the data exchange.

source

Layer 4 well-known port range (according to IANA):

0 - 1023

Layer 4 registered port range (according to IANA):

1024 - 49151

Layer 4 ephemeral port range (according to IANA):

49152 - 65535

The TCP header […] field is used for flow control.

window size

TCP three-way handshake order of messages (establishing a connection):

SYN ->

TCP four-way handshake order of messages (terminating a connection):

FIN ->

[TCP/UDP] is connection-oriented.

TCP

[TCP/UDP] is connectionless.

UDP

TCP: […] is used to indicate the sequence number of the next segment the host expects to receive.

Forward acknowledgement

TCP: A ‘[…]’ is used to dynamically adjust how large the window size is.

sliding window

For applications like real-time voice and video, [TCP/UDP] is preferred.

UDP

For applications that require reliable communications, [TCP/UDP] is preferred.

TCP