Network Security Baseline
Commonly Used Protocols in the Infrastructure
Downloads: This chapterpdf (PDF - 340.0KB) The complete bookPDF (PDF - 3.8MB) | Feedback

Commonly Used Protocols in the Infrastructure

Table Of Contents

Commonly Used Protocols in the Infrastructure


Commonly Used Protocols in the Infrastructure


Table B-1 lists commonly used protocols found in the infrastructure.

Table B-1 Commonly Used Protocols in the Infrastructure

Protocol
Protocol Number, TCP/UDP Ports, Message Type

BGP

TCP/179

OSPF

Prot 89

EIGRP

Prot 88

GRE

Prot 47

AH

Prot 51

ESP

Prot 50

TACACS+

TCP/49

RADIUS

UDP/1812, UDP/1813; in the past UDP/1645 and UDP/1646

SSH

TCP/22

TELNET

TCP/23

SNMP

UDP/161

NTP

UDP/123

ICMP

Prot 1, ttl-exceeded, port-unreachable, echo, echo-reply

DNS

UDP/53