ICND1 WAN Technologies & Network Security 3

Question 1

A router is configured with 'ip nat inside source list 1 interface Serial0/0 overload'. What does the 'overload' keyword enable?

Accepted Answer

PAT (Port Address Translation) using one public IP

Answer

The 'overload' keyword enables PAT, which multiplexes many private addresses to a single public IP using unique port numbers.

Question 2

Which WAN connection type provides a dedicated, always-on circuit between two locations with guaranteed bandwidth?

Accepted Answer

Leased line (point-to-point)

Answer

Leased lines provide a permanent dedicated circuit between two sites with consistent, guaranteed bandwidth.

Question 3

What is the function of the 'established' keyword in an extended ACL?

Accepted Answer

Permits TCP packets that are part of an existing session (ACK or RST set)

Answer

The 'established' keyword matches TCP packets with ACK or RST flags set, indicating they belong to an existing connection.

Question 4

In a GRE tunnel configuration, which command defines the tunnel source on a Cisco router?

Accepted Answer

tunnel source <interface or IP>

Answer

'tunnel source' specifies the interface or IP address used as the GRE tunnel's originating endpoint.

Question 5

Which of the following is a characteristic of CHAP authentication used with PPP?

Accepted Answer

A three-way handshake uses a challenge and MD5 hash

Answer

CHAP uses a three-way handshake where the authenticator sends a challenge and the peer responds with an MD5 hash of the challenge and password.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test