Networking & Troubleshooting

Question 1

What is the difference between a switch and a router?

Answer 1

A switch connects devices within the same LAN (Layer 2). A router connects different networks together (Layer 3).

Question 2

Name the 7 layers of the OSI model in order.

Answer 2

Physical, Data Link, Network, Transport, Session, Presentation, Application.

Question 3

What is the difference between TCP and UDP?

Answer 3

TCP is connection-oriented (reliable, guarantees delivery) whereas UDP is connectionless (faster, no error checking).

Question 4

What is the difference between single-mode and multi-mode fiber?

Answer 4

Single-mode has a smaller core, travels longer distances, and is used for backbones. Multi-mode has a larger core and is used for shorter distances.

Question 5

What does NAT stand for?

Answer 5

Network Address Translation.

Question 6

A server cannot connect to the internet. What is your troubleshooting process?

Answer 6

1. Physical link (lights on NIC) 2. IP address configuration 3. Default gateway 4. DNS resolution 5. Firewall/ACL rules.