IS 340 Review Router 101 Brigham Young University-Idaho

Network Layer Path Determination

Internal Configuration Components

Internal Components of a 2600 Router

External Connections on a 2600 Router

Connecting Console Interfaces 1. Configure terminal emulation software on the PC for the following: The appropriate com port 9600 baud 8 data bits 1 stop bit No parity No flow control 2. Connect a rollover cable to the router console port (RJ-45 connector). 3. Connect the other end of the rollover cable to the RJ-45 to DB-9 adapter 4. Attach the female DB-9 adapter to a PC.

Computer or Terminal Console Connection

Modem Connection to Console or Auxiliary Port

Router User Interface

Operating Environments

Steps in Router Initialization

Router User Interface Modes

The User Interface Error Indicator

Using Help

Using IOS Command history

Configuring a Router Name A router should be given a unique name as one of the first configuration tasks. This task is accomplished in global configuration mode using the following commands: Router(config)#hostname Tokyo Tokyo(config)#

Configuring Router Passwords

Host Name Resolutions  Host name resolution is the process that a computer system uses to associate a host name with an IP address.  Host names, unlike DNS names, are significant only on the router on which they are configured.

Configuring Host Tables

Viewing the Host Table LAB_A(config)#ip host LAB_A LAB_A(config)#ip host LAB_B LAB_A(config)#ip host LAB_C LAB_A(config)#ip host LAB_D LAB_A(config)#ip host LAB_E LAB_A(config)# LAB_A#show hosts Default domain is not set Name/address lookup uses domain service Name servers are Host Flags Age Type Address(es) LAB_B (perm, OK) 0 IP LAB_C (perm, OK) 0 IP LAB_E (perm, OK) 0 IP LAB_A (perm, OK) 0 IP LAB_D (perm, OK) 0 IP LAB_A#

Using the copy Command

Using the copy tftp running- config Command

What are ACLs? ACLs are lists of instructions you apply to a router's interface to tell the router what kinds of packets to accept and what kinds to deny.

ACLs must be defined on a per-protocol, per direction, or per port basis  ACL must be defined for each interface  ACL must be defined for each protocol enabled on the interface  ACLs control traffic in one direction at a time on an interface

How ACLs Work

How ACL’s Work

Protocols with ACLs Specified by Numbers

Wildcard Masks  Don’t confuse with subnet masks  0 mean match with IP number  255 means accept any number in this range

Standard ACLs

Extended ACLs

Extended IP Access List Examples (continued)

Placing ACLs  Standard ACLs should be placed close to the destination.  Extended ACLs should be placed close to the source.