Multiple choice

Refer to the exhibit. What is accomplished when both commands are configured on the router?

  1. The commands filter UDP and TCP traffic coming to the router.

  2. The commands disable any TCP or UDP request sent by the routing protocols.

  3. The commands disable the services such as echo, discard, and chargen on the router to prevent security vulnerabilities.

  4. The commands disable the BOOTP and TFTP server services to prevent security vulnerabilities.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The commands shown disable minor TCP and UDP services (echo port 7, discard port 9, chargen port 19) that run on Cisco routers by default. These services can be exploited in denial-of-service attacks like the fraggle attack or used for reconnaissance. Disabling them is a security hardening best practice. The 'no service tcp-small-servers' and 'no service udp-small-servers' commands specifically target these legacy services.

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