CompTIA Security+ Question L-41

A router has a single Ethernet connection to a switch. In the router configuration, the Ethernet interface has three sub-interfaces, each configured with ACLs applied to them and 802.1q trunks.
Which of the following is MOST likely the reason for the sub-interfaces?

A. The network uses the subnet of 255.255.255.128.
B. The switch has several VLANs configured on it.
C. The sub-interfaces are configured for VoIP traffic.
D. The sub-interfaces each implement quality of service.

Answer: B

Explanation:
A subinterface is a division of one physical interface into multiple logical interfaces. Routers commonly employ subinterfaces for a variety of purposes, most common of these are for routing traffic between VLANs. Also, IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet network.

CompTIA Security+ Question G-43

Which of the following would allow the organization to divide a Class C IP address range into several ranges?

A. DMZ
B. Virtual LANs
C. NAT
D. Subnetting

Answer: D

Explanation:
Subnetting is a dividing process used on networks to divide larger groups of hosts into smaller collections.