Network Management

CCNA 4 Chapter 7

Monitoring the Network

Connection monitoring takes place every day when users log onPing only shows that the connection is down, not where it is downTraffic monitoring is a more sophisticated method of network monitoring:– Microsoft Windows NT Network Monitor and Fluke's Network

Analyser– Detect failing equipment, and determine if a component is

overloaded or poorly configured

SNMPSimple Network Management Protocol

Gathers data and organizes it so it is useful to centralized network administrator

Manipulates and controls data from the network

MIB database resides on each device managed

Agents can be routers, switches or hubs that

communicate with the console (polling or trapping)

RMONRemote Monitoring

Extensions to SNMP, looks at the network as a whole

An RMON probe is located on each segment of network being monitored

Redundancy and distributed management

SNMP is still required for RMON to operate on a network

Tool

Troubleshooting NetworksTroubleshooting methods include:– Process of Elimination– Divide and Conquer

Software tools include:Use Main Options

Verify basic connection -n sets the number of packets (default 5)

Track packets by hops -j specifies loose source route; -h max hops

Layer 7 connectivity

View protocol statistics -s -p tcp shows TCP protocol statistics

Map IP to MAC address -a show contents of cache; -s add static entry

View hosts IP settings /all ; /renew requests a new DHCP lease

Tool

ping

tracert

telnet

netstat

arp

ipconfig

Problem Solving Stages