Other Useful Protocols

What is the primary purpose of ICMP?

• To transfer large files between network devices.

• To establish secure, encrypted tunnels for private communication.

• To check the reachability and operational status of network devices.

• To assign IP addresses dynamically to new devices on a network.

What is a key difference between Generic Routing Encapsulation (GRE) and Virtual Private Networks (VPNs) regarding data security?

• GRE provides built-in encryption, while VPNs require external encryption protocols.

• VPNs are used for local networks, while GRE is for wide area networks.

• GRE encapsulates traffic within IP packets, whereas VPNs do not.

• VPNs encrypt data traversing a public network, while GRE does not provide built-in encryption.

Which OSI layer does IPSec provide security for, and what security features does it offer?

• Layer 2; provides MAC address filtering and VLAN tagging.

• Layer 3; offers authentication, encryption, integrity, and anti-replay.

• Layer 4; ensures reliable data transfer and flow control.

• Layer 7; manages application-level protocols and data formatting.

What protocol and port are commonly used in Phase I of the Internet Key Exchange (IKE) process to create a shared secret key?

• TCP/80

• UDP/500

• TCP/443

• UDP/161

Which IPsec mode encrypts the original IP header along with the data?

• Transport mode

• Tunnel mode

• Authentication Header (AH) mode

• Encapsulation Security Payload (ESP) mode