Cisco CCNA Practice Test 5

Question 1

Which protocol does OSPF use to send routing updates?

Accepted Answer

IP protocol 89 (multicast)

Answer

OSPF uses IP protocol number 89 and sends updates via multicast addresses 224.0.0.5 and 224.0.0.6, not TCP or UDP.

Question 2

What is the function of the Spanning Tree Protocol (STP) root bridge?

Accepted Answer

It serves as the logical center of the spanning tree topology

Answer

The root bridge is elected as the logical center of the STP topology and all path cost calculations are made relative to it.

Question 3

Which access list statement permits all IP traffic from the 10.0.0.0/8 network?

Accepted Answer

permit ip 10.0.0.0 0.255.255.255 any

Answer

The wildcard mask for a /8 network is 0.255.255.255, meaning any address starting with 10 is matched.

Question 4

Which command configures an interface as a VLAN trunk using IEEE 802.1Q encapsulation?

Accepted Answer

switchport trunk encapsulation dot1q

Answer

The 'switchport trunk encapsulation dot1q' command must be issued before setting the port to trunk mode on some Cisco platforms.

Question 5

What is a characteristic of a full-mesh WAN topology?

Accepted Answer

Every site has a direct connection to every other site

Answer

In a full-mesh topology, every site has a direct point-to-point connection to every other site, providing maximum redundancy.