☛ What is the difference between layer 2 and layer 3 in the OSI model?

☛ What is the difference between a hub, switch, and router?

☛ What is a VLAN?

☛ What is the difference between TCP and UDP?

☛ How do you distinguish a DNS problem from a network problem?

☛ What are a runt, Giant, and collision?

☛ What is a broadcast storm?

☛ What is the purpose of VRRP?

☛ What is a VPN?

☛ What is a default route?

☛ How do you set a default route on an IOS Cisco router?

☛ What is a metric?

☛ What is a MAC address?

☛ What is ARP/RARP?

☛ Describe a TCP connection sequence.

☛ What is MTU?

☛ What other TCP setting can you modify besides MTU to shorten packets?