Page 771 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

communications (HTTPS) but is capable of securing any Application
layer protocol communications.

Line Print Daemon (LPD), TCP Port 515 This is a network service

that is used to spool print jobs and to send print jobs to printers.

X Window, TCP Ports 6000–6063 This is a GUI API for
command-line operating systems.

Network File System (NFS), TCP Port 2049 This is a network
service used to support file sharing between dissimilar systems.

Simple Network Management Protocol (SNMP), UDP Port 161
(UDP Port 162 for Trap Messages) This is a network service used

to collect network health and status information by polling monitoring
devices from a central monitoring station.

SNMPv3

Simple Network Management Protocol (SNMP) is a standard
network-management protocol supported by most network devices
and TCP/IP-compliant hosts. These include routers, switches,

bridges, wireless access points (WAPs), firewalls, VPN appliances,
modems, printers, and so on. Through the use of a management
console, you can use SNMP to interact with various network
devices to obtain status information, performance data, statistics,
and configuration details. Some devices support the modification

of configuration settings through SNMP.
Early versions of SNMP relied on plaintext transmission of

community strings as authentication. Communities were named
collections of network devices that SNMP management consoles
could interact with. The original default community names were
public and private. The latest version of SNMP allows for
encrypted communications between devices and the management

console, as well as authentication factors that are customized for
robust authentication protection.

SNMP operates over UDP ports 161 and 162. UDP port 161 is used
by the SNMP agent (that is, network device) to receive requests,