Question

All the packets coming from outside the network are filtered at which of the following device?

• A. Switch
• B. Gateway
• C. Hub
• D. Router

Hint:

A Gateway serves as a "security checkpoint" or "border control" for a network.
It connects completely different protocols and networks, making it the perfect place to enforce firewall security and packet filtering!

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Filtering incoming network traffic is a primary function of devices that operate at the network layer or higher, often employing Access Control Lists (ACLs) to permit or deny packets.

Step 2: Detailed Explanation:
- Router: Uses routing tables and ACLs to inspect incoming packets and filter them based on source, destination, and protocol.
- Switch: Operates mostly at the data link layer (Layer 2) and primarily forwards frames based on MAC addresses.
- Hub: Just broadcasts signals to all ports.
- Gateway: Acts as a bridge between two different networks but is a broader term than a router.

Step 3: Final Answer:
Packets are filtered at the Router.