CCST IP Addressing & Subnetting

Question 1

What is a valid IPv4 address?

Accepted Answer

192.168.1.1

Answer

A valid IPv4 address consists of four octets (numbers) separated by dots, where each octet must be an integer between 0 and 255, inclusive. Options B, C, and D contain numbers (300, 256, 999) that fall outside this permissible range, making them invalid. The address 192.168.1.1 correctly adheres to these rules, as all its octets are within the 0-255 range.

Question 2

What is the subnet mask for a Class C network?

Accepted Answer

255.255.255.0

Answer

In traditional Class C networking, the first three octets of an IP address identify the network, while the last octet identifies the host within that network. A subnet mask of 255.255.255.0 reflects this structure by having '255' in the first three octets (designating the network portion) and '0' in the last octet (designating the host portion). This mask allows for 254 usable host IP addresses in a Class C network.

Question 3

What is CIDR notation?

Accepted Answer

/24

Answer

CIDR (Classless Inter-Domain Routing) notation is a concise method for representing an IP address and its associated network mask. It appends a forward slash followed by a number to the IP address, where this number indicates the count of contiguous '1' bits in the subnet mask. For instance, /24 signifies that the first 24 bits of the IP address define the network portion, which corresponds to a subnet mask of 255.255.255.0.

Question 4

How many hosts can a /29 subnet support?

Accepted Answer

6

Answer

A /29 subnet mask indicates that 29 bits are used for the network portion, leaving 3 bits for the host portion (32 total bits - 29 network bits = 3 host bits). This allows for 2^3 = 8 total IP addresses in the subnet. However, two addresses are reserved: one for the network ID and one for the broadcast address. Therefore, the number of usable host addresses is 8 - 2 = 6.

Question 5

Which address is reserved for broadcasts?

Accepted Answer

Last IP in subnet

Answer

Within any given IP subnet, the very last IP address is always reserved for the broadcast address. This special address is used to send data simultaneously to all devices connected within that specific subnet. Conversely, the first IP address in a subnet is reserved for the network address itself.

(CCST) Cisco Certified Support Technician Networking Practice Test

(CCST) Cisco Certified Support Technician Networking Practice Test

CCST IP Addressing & Subnetting