Cisco CCNA Practice Test 4

Question 1

What is the maximum number of usable host addresses in a /28 subnet?

Accepted Answer

14

Answer

A /28 subnet has 16 total addresses (2^4), with 14 usable host addresses after subtracting network and broadcast.

Question 2

Which Cisco IOS command saves the running configuration to NVRAM?

Accepted Answer

write memory

Answer

The 'write memory' command (or its equivalent 'copy running-config startup-config') saves the current configuration to NVRAM.

Question 3

Which field in an IP packet header is decremented by one at each router hop?

Accepted Answer

TTL

Answer

The Time to Live (TTL) field is decremented by 1 at each router hop; when it reaches 0, the packet is discarded.

Question 4

What is the purpose of the Cisco Discovery Protocol (CDP)?

Accepted Answer

To discover directly connected Cisco devices and their capabilities

Answer

CDP is a Cisco proprietary Layer 2 protocol that allows Cisco devices to discover and share information about directly connected neighbors.

Question 5

Which type of NAT maps one private IP address to one public IP address?

Accepted Answer

Static NAT

Answer

Static NAT creates a permanent one-to-one mapping between a private IP address and a public IP address.