A network technician is provisioning host interfaces within the enterprise block assigned … — Cisco CCNA

A network technician is provisioning host interfaces within the enterprise block assigned as $10.80.192.0/22$ . Which of the following IPv4 addresses are valid, usable host addresses within this specific subnetwork? (Select TWO.)

$10.80.192.1$ Answer
$10.80.195.250$ Answer
C
$10.80.192.0$
D
$10.80.195.255$
E
$10.80.196.1$

Answer

The addresses

10.80.192.1

and

10.80.195.250

are the valid usable host addresses within the

10.80.192.0/22

subnetwork.

The prefix

/22

yields a subnet mask of

255.255.252.0

, providing

2^{10} - 2 = 1022

usable host addresses per subnet. The subnet boundaries run from network ID

10.80.192.0

to broadcast address

10.80.195.255

. Thus, the valid host range spans from

10.80.192.1

through

10.80.195.254

. Both

10.80.192.1

and

10.80.195.250

fall strictly inside this range.

Step-by-Step Solution

Determine the subnet mask from prefix length

Prefix

/22

corresponds to a subnet mask of

255.255.252.0

Converting

/22

to binary gives 22 network bits and 10 host bits (

11111111.11111111.11111100.00000000

Calculate block size and network boundary

Block size in the 3rd octet is

256 - 252 = 4

. The subnet starts at

10.80.192.0

and ends right before

10.80.196.0

The 3rd octet increments in multiples of 4 (

0, 4, 8, \dots, 192, 196

). Network ID is

10.80.192.0

Identify broadcast address and usable host range

Broadcast address is

10.80.195.255

. Usable host range is

10.80.192.1

10.80.195.254

Usable host addresses are all IP values between the network ID and the broadcast ID.

Evaluate choices against the usable range

10.80.192.1

and

10.80.195.250

lie within

[10.80.192.1, 10.80.195.254]

10.80.192.0

is the network ID,

10.80.195.255

is the broadcast ID, and

10.80.196.1

is in the next subnet.

Only IP addresses inside the calculated host range can be assigned to devices.

Key Concept

IPv4 Subnet Boundaries and Host Address Ranges

Question

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Key Concept

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