Ccna routing and Switching Complete Study Guide

telnet 172.16.20.254

Trying 172.16.20.254 ... Open

Server1>

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Chapter 20 

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  Troubleshooting IP, IPv6, and VLANs

Okay, great!

Step 2: Create an ACL on R1 that stops telnetting to the remote host of 172.16.20.254. 

Using a named ACL, start with the protocol (IP or IPv6), choose either a standard or extended 

list, and then name it. The name is absolutely case sensitive when applying to an interface.

 

R1(config)#

ip access-list extended Block_Telnet

R1(config-ext-nacl)#

Step 3: Once you have created the named list, add your test parameters.

R1(config-ext-nacl)#

deny tcp host 10.1.1.1 host 172.16.20.254 eq 23

R1(config-ext-nacl)#permit ip any any

Step 4: Verify your access list.

 

R1(config-ext-nacl)#