ICND1 WAN Technologies & Network Security 2

Question 1

Which WAN technology uses a series of virtual circuits identified by DLCIs to connect remote sites?

Accepted Answer

Frame Relay

Answer

Frame Relay uses Data Link Connection Identifiers (DLCIs) to identify virtual circuits between endpoints.

Question 2

A network administrator needs to block all Telnet access to routers from outside the corporate network. Which ACL entry accomplishes this?

Accepted Answer

deny tcp any any eq 23

Answer

Telnet operates on TCP port 23, so 'deny tcp any any eq 23' blocks all Telnet connections.

Question 3

What does the LMI (Local Management Interface) provide in a Frame Relay network?

Accepted Answer

Status signaling between the DTE and Frame Relay switch

Answer

LMI provides keepalive and status signaling between the router (DTE) and the Frame Relay switch at the local loop.

Question 4

Which type of VPN allows remote users to securely access corporate resources over the internet using a client application?

Accepted Answer

Remote-access VPN

Answer

Remote-access VPNs use client software to allow individual users to connect securely to the corporate network.

Question 5

What is the primary purpose of NAT (Network Address Translation) in a WAN environment?

Accepted Answer

To allow private IP addresses to communicate over the public internet

Answer

NAT translates private RFC 1918 addresses to public IP addresses, enabling internet access from private networks.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test