ICND1 Network Fundamentals & IP Addressing 3

Question 1

How many subnets are created when you borrow 3 bits from the host portion of a Class C address?

Accepted Answer

8

Answer

Borrowing 3 bits yields 2^3 = 8 subnets (using the all-zeroes and all-ones subnets per modern practice).

Question 2

What type of IPv4 address is 169.254.10.5?

Accepted Answer

APIPA / link-local

Answer

The 169.254.0.0/16 range is APIPA (Automatic Private IP Addressing), assigned when DHCP is unavailable.

Question 3

Which device operates at Layer 1 and simply regenerates the electrical signal?

Accepted Answer

Hub

Answer

A hub is a Layer 1 device that repeats electrical signals out all ports without any intelligence.

Question 4

What is the decimal value of the binary number 11001010?

Accepted Answer

202

Answer

128+64+8+2 = 202 (bits 7,6,3,1 are set).

Question 5

Which class of IP address uses the default subnet mask 255.255.0.0?

Accepted Answer

Class B

Answer

Class B addresses (128.0.0.0–191.255.255.255) have a default mask of 255.255.0.0 (/16).

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test