Well-known Ports - Service to Ports

Question 1

FTP Data

Answer 1

TCP 20

Question 2

FTP Control

Answer 2

TCP 21

Question 3

SSH

Answer 3

TCP 22

Question 4

Telnet

Answer 4

TCP 23

Question 5

SMTP

Answer 5

TCP 25

Question 6

DNS

Answer 6

UDP/TCP 53

Question 7

DHCP Server

Answer 7

UDP 67

Question 8

DHCP Client

Answer 8

UDP 68

Question 9

TFTP

Answer 9

UDP 69

Question 10

HTTP

Answer 10

TCP 80

Question 11

POP3

Answer 11

TCP 110

Question 12

SNMP

Answer 12

UDP 161

Question 13

SSL

Answer 13

TCP 443

Question 14

Syslog

Answer 14

UDP 514

Question 15

RTP Voice/Video

Answer 15

UDP 16,384 to 32,767

Question 16

GRE

Answer 16

IP 47

Question 17

BGP

Answer 17

TCP 179

Question 18

TACACS+

Answer 18

TCP 49

Question 19

RIP

Answer 19

UDP 520

Question 20

OSPF

Answer 20

IP 89

Question 21

EIGRP

Answer 21

IP 88

Question 22

RADIUS Authentication (per RFC)

Answer 22

TCP/UDP 1812

Question 23

IGMPv2

Answer 23

IP 2

Question 24

PIM Control

Answer 24

IP 103

Question 25

NTP

Answer 25

UDP 123

Question 26

IPSec Authentication Header (AH)

Answer 26

IP 51

Question 27

ISAKMP

Answer 27

UDP 500

Question 28

ESP

Answer 28

IP 50

Question 29

LISP Data Plane header

Answer 29

UDP 4341

Question 30

LISP Control Plane i.e. Map Notify Msg

Answer 30

UDP 4342

Question 31

VXLAN (IANA)

Answer 31

UDP 4789

Question 32

VXLAN (Linux)

Answer 32

UDP 8472

Question 33

RADIUS Accounting (Cisco)

Answer 33

TCP 1646

Question 34

RADIUS Accounting (per RFC)

Answer 34

TCP/UDP 1813

Question 35

Traceroute

Answer 35

IP 33434

Question 36

RADIUS Authentication (Cisco)

Answer 36

TCP 1645

Question 37

VRRPv3

Answer 37

IP 112

Question 38

HSRPv1 and v2

Answer 38

UDP 1985

Question 39

HSRP for IPV6

Answer 39

UDP 2029

Question 40

Syslog over TLS

Answer 40

TCP 6514

Question 41

TCP

Answer 41

IP 6

Question 42

UDP

Answer 42

IP 17