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Learning by Doing: CISCO Certified Network ... - SCN Research

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Loopback Interfaces<br />

Objectives:<br />

To learn how and when to use loopback interfaces.<br />

Tools and Materials:<br />

(1) router<br />

(1) switch<br />

(2) Straight-through cables<br />

(1) rollover cable<br />

(1) workstation with Hyperterminal program<br />

Background:<br />

Loopback interfaces are used for a variety of situations: for OSPF selection,<br />

troubleshooting, and, for us, allowing us to test multiple connections without having to<br />

actually have a network set up.<br />

Lab Diagram:<br />

e0<br />

con<br />

s0<br />

NIC<br />

COM1<br />

Workstation “A”<br />

Routers<br />

Hostnames Bell<br />

E0 192.168.3.1/24<br />

S0 192.168.4.1/24<br />

S1<br />

n/a<br />

Workstations A<br />

IP 192.168.3.2<br />

SM 255.255.255.0<br />

GW 192.168.3.1<br />

Step-<strong>by</strong>-Step Instructions:<br />

1. Set up the lab as shown. Since there is no cable “physically” connected to serial 0<br />

we should not be able to ping it. We can verify that no cable is present <strong>by</strong> using<br />

197

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