CCNA Day 30 - TCP & UDP

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Last updated 11:13 PM on 4/23/26
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39 Terms

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TCP Port 20

FTP Data = TCP Port […]

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TCP Port 21

FTP Control = TCP Port […]

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TCP Port 22

SSH = TCP Port […]

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TCP Port 23

Telnet = TCP Port […]

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TCP Port 25

SMTP = TCP Port […]

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TCP Port 80

HTTP = TCP Port […]

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TCP Port 110

POP3 = TCP Port […]

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TCP Port 443

HTTPS = TCP Port […]

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UDP Port 67

DHCP Server = UDP Port […]

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UDP Port 68

DHCP Client = UDP Port […]

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UDP Port 69

TFTP = UDP Port […]

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UDP Port 161

SNMP Agent = UDP Port […]

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UDP Port 162

SNMP Manager = UDP Port […]

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UDP Port 514

Syslog = UDP Port […]

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TCP/UDP Port 53

DNS = TCP/UDP Port […]

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TCP Port 23

Telnet = TCP Port […]

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Transmission Control Protocol

What does TCP stand for?

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User Datagram Protocol

What does UDP stand for?

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Port Numbers

What are Layer 4 addresses?

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TCP

[TCP/UDP] provides reliable data transfer

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TCP

[TCP/UDP] provides error recovery

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TCP

[TCP/UDP] provides data sequencing

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TCP

[TCP/UDP] provides flow control

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UDP

[TCP/UDP] has less overhead

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Application Layer

What layer’s protocol is indicated by the Layer 4 destination port number?

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Source port number

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

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0-1023

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

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1024-49151

Layer 4 registered port range (according to IANA)

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49152-65535

Layer 4 ephemeral port range (according to IANA)

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Window Size

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

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SYN - >

< - SYN-ACK

ACK - >

TCP three-way handshake order or messages for establishing a connection

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FIN - >

< - ACK

< - FIN

ACK - >

TCP four-way handshake order of messages for terminating a connection

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TCP

[TCP/UDP] is connection-oriented

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UDP

[TCP/UDP] is connectionless

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Forward Acknowledgement

Used in TCP to indicate the sequence number of the next segment the host expects to receive

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Sliding Window

Used in TCP to dynamically adjust how large the window size is

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UDP

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

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TCP

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

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