Chapter 9 & 10TCP/IP

TCP/IP Model

Application Transport Internet Internet Access

Application Layer Protocols - 7

FTP – 21 Telnet – 23 SMTP – 25 DNS – 53 TFTP – 69 SNMP – 161

Transport Layer Protocols – 4

TCP – What are its functions? UDP – How does it differ from TCP?

Network Layer Protocols – 3

IP RIP, IGRP, OSPF ICMP PING

Network Access – 1&2

MAC Ethernet IEEE 802.X FDDI Token Ring Topology

• Logical

• Physical

ARP

Address Resolution Protocol Given an IP Address, what is the MAC? ARP tables kept by Routers From DOS prompt ARP –a At router Show ARP To rebuild ARP table, Clear ARP To start use PING

Testing Connectivity

PING Trace Trace * * *

TCP/IP Subnetting

Create a group of subnets from one large network address.

Subnets have an address – all host bits are zeros. Subnets have a broadcast address – all host bits

are ones. Useable address ranges are the bits in-between What would be the flooded broadcast address for

152.43.0.0? What would be the directed broadcast address of

address 195.23.74.83 SN Mask 255.255.255.192?

Host Tables

IP host command Router(config)#ip host <hostname> ip

address(es) Example:

• Ip host ATC 152.43.61.1 175.6.34.7

Name Server Configuration

Supplies DNS server addresses to routers

Ip name-server <server ip address> Example:

• Ip name-server 152.43.29.51 152.43.29.52

Turn Off DNS

DNS turned on by default If turned off, restart by-

• Router(config)#ip domain-lookup

Turn off with-• Router(config)#no ip domain-lookup

To see host table:• Router#show hosts

Connectivity Testing

PING – ICMP Echo request Trace – uses host name Telnet (most complete)