Describe the need and importance of subnet masking. Give an example of subnet mask.

Describe the need and importance of subnet masking. Give an example of subnet mask.
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1 Answer

Answer :

Subnet mask is a 32 bits long address used to distinguish between network address and host address in IP address. Subnet mask is always used with IP address. Subnet mask has only one purpose, to indentify which part of an IP address is network address and which part is host address. With subnetting, IP addresses use a 3-layer hierarchy:

Network

Subnet

Host

Improves efficiency of IP addresses by not consuming an entire address space for each physical network. Reduces router complexity. Since external routers do not know about subnetting, the complexity of routing tables at external routers is reduced. Note: Length of the subnet mask need not be identical at all subnetworks. For example how will we figure out network partition and host partition from IP address 192.168.1.10 ? Here we need subnet mask to get details about network address and host address. In decimal notation subnet mask value 1 to 255 represent network address and value 0 [Zero] represent host address. In binary notation subnet mask on bit [ 1] represent network address while off bit[0] represent host address.

In decimal notation

 IP address 192.168.1.10

 Subnet mask 255.255.255.0

 Network address is 192.168.1 and host address is 10.

In binary notation

 IP address 11000000.10101000.00000001.00001010

 Subnet mask 11111111.11111111.11111111.00000000
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Related questions

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Description : What do you understand by subnet masking?

Last Answer : A subnet mask is a screen of numbers used for routing traffic within a subnet. Once a packet has arrived at an organization's gateway or connection point with its unique network number, it can be routed to ... to handle the entire 32 bit address; it can simply look at the bits selected by the mask.

Explain following term: (i) Subnet Masking (ii) ARP (iii) FTP (iv) TCP

Description : Explain following term: (i) Subnet Masking (ii) ARP (iii) FTP (iv) TCP

Last Answer : (i) Subnet masking: Subnet mask is a 32 bits long address divided into 4 octets used to distinguish between network address and host address in IP address. It is always used with IP ... to provide a reliable service. Corrupt and lost segments are retransmitted, and duplicate segments are discarded.

Which among the following definitions is correct: a) Address - The unique number ID assigned to one host or interface in a network b) Subnet - A portion of a network sharing a particular subnet address c) Subnet mask - A 32 bit combination used to describe which portion of an address refers to the subset and which part refers to the host d) Interface - A network connection e) None of These f) All of the Above

Description : Which among the following definitions is correct: a) Address - The unique number ID assigned to one host or interface in a network b) Subnet - A portion of a network sharing a particular subnet address c) ... to the host d) Interface - A network connection e) None of These f) All of the Above

Last Answer : f) All of the Above

Which among the following definitions is correct: a) Address - The unique number ID assigned to one host or interface in a network b) Subnet - A portion of a network sharing a particular subnet addressc) Subnet mask - A 32 bit combination used to describe which portion of an address refers to thesubset and which part refers to the hostd) Interface - A network connectione) None of Thesef) All of the Above

Description : Which among the following definitions is correct: a) Address - The unique number ID assigned to one host or interface in a network b) Subnet - A portion of a network sharing a particular subnet address c) ... to the host d) Interface - A network connection e) None of These f) All of the Above

Last Answer : f) All of the Above

Correct answer: A By borrowing 5 bits from the last octet, you can. have 30 subnets. If you borrowed only 4 bits you could only have 14 subnets. The formula is (2 to the power of n)-2. By borrowing 4 bits, you have (2×2x2×2)-2=14. By borrowing 5 bits, you have (2×2x2×2x2)-2=30. To get 20 subnets, you would need to borrow 5 bits so the subnet mask would be 255.255.255.248

Description : hosts per subnet. What subnet mask will you use? * 255.255.255.248 * 255.255.255.128 * 255.255.255.192 * 255.255.255.240

Last Answer : Correct answer: A By borrowing 5 bits from the last octet, you can. have 30 subnets. If you borrowed only 4 bits you could only have 14 subnets. The formula is (2 to the power of n)-2. By borrowing ... To get 20 subnets, you would need to borrow 5 bits so the subnet mask would be 255.255.255.248.

What is a subnet mask ?

Description : What is a subnet mask ?

Last Answer : At least two pieces of information are required for each TCP / IP host. The first is an IP address and the second is a subnet mask. The job of the subnet mask is to identify which bits of the ... default subnet mask is used . In that case the amount of this bit will be determined with subnet mask.

How Do I Solve Custom Subnet Mask Problem 10?

Description : How Do I Solve Custom Subnet Mask Problem 10?

Last Answer : .Hello everyone,Here's my overview:Hello everyone, I seem to have a problem with this custom subnetmasking problem. Number needed usable hosts:60 NetworkAddress:198.100.10.0 I've already figured these: ... 255.255.240 butchecked online and wasn't right). Can someone help me with thisproblem? Thanks.

Why is the subnet mask important in determining the network address?

Description : Why is the subnet mask important in determining the network address?

Last Answer : What is the answer ?

You are designing a network which needs to support 200 users. You don't plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs? Select the best answer. A. 255.255.0.0 B. 255.255.255.0 C. 255.0.0.0 D. 255.224.0.0 E. 255.255.255.200

Description : You are designing a network which needs to support 200 users. You don't plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs? Select the best answer. A. 255.255.0.0 B. 255.255.255.0 C. 255.0.0.0 D. 255.224.0.0 E. 255.255.255.200

Last Answer : 255.255.255.0

With anIP address set starting with 150, you currently havesix offices that you are treating as subnets. Plans are in place toopen 10 more officesbefore the end of theyear. What subnet mask should you useto satisfy the needed numberof subnets and maximize thenumberof hosts available at eachsite? A. 192 B. 224 C. 240 D. 248 E. 252

Description : With anIP address set starting with 150, you currently havesix offices that you are treating as subnets. Plans are in place toopen 10 more officesbefore the end of theyear. What subnet mask should you useto ... maximize thenumberof hosts available at eachsite? A. 192 B. 224 C. 240 D. 248 E. 252

Last Answer : 248

You are working with three networks that have the network IDs 192.168.5.0, 192.168.6.0, and192.168.7.0. What subnet mask can you use to combine these addresses intoone? A. 255.255.252.0 B. 225.255.254.0 C. 255.255.255.240 D. 255.255.255.252

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Last Answer : 255.255.252.0

On a class B network, how manyhostsare availableat eachsite witha subnet mask of 248? A. 16,382 B. 8,190 C. 4,094 D. 2,046 E. 1,022

Description : On a class B network, how manyhostsare availableat eachsite witha subnet mask of 248? A. 16,382 B. 8,190 C. 4,094 D. 2,046 E. 1,022

Last Answer : 2,046

Which of the following best illustrates the default subnet mask for a class A,B, and C Network? A. 0.0.0.0,0.0.0.1, 0.0.1.1 B. 255.255.255.0, 255.255.0.0,255.0.0.0 C. 255.0.0.0, 255.255.0.0, 255.255.255.0 D. 255.255.0.0, 255.255.255.0,255.255.255.255 E. None of the above

Description : Which of the following best illustrates the default subnet mask for a class A,B, and C Network? A. 0.0.0.0,0.0.0.1, 0.0.1.1 B. 255.255.255.0, 255.255.0.0,255.0.0.0 C. 255.0.0.0, 255.255.0.0, 255.255.255.0 D. 255.255.0.0, 255.255.255.0,255.255.255.255 E. None of the above

Last Answer : 255.0.0.0, 255.255.0.0, 255.255.255.0

With anIP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts? A. 192 B. 224 C. 240 D. 248 E. 252

Description : With anIP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts? A. 192 B. 224 C. 240 D. 248 E. 252

Last Answer : 252

What partof 192.168.10.51 is the Network ID, assuming a default subnet mask? A. 192 B. 192.168.10 C. 0.0.0.5 D. 51 E. None of the above

Description : What partof 192.168.10.51 is the Network ID, assuming a default subnet mask? A. 192 B. 192.168.10 C. 0.0.0.5 D. 51 E. None of the above

Last Answer : 192.168.10

What is the default subnet mask for a class C network? A. 127.0.0.1 B. 255.0.0.0 C. 255.255.0.0 D. 255.255.255.0 E. None of the above

Description : What is the default subnet mask for a class C network? A. 127.0.0.1 B. 255.0.0.0 C. 255.255.0.0 D. 255.255.255.0 E. None of the above

Last Answer : 255.255.255.0

You havea class A network address 10.0.0.0 with 40subnets,but arerequiredto add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should youassign? A. 255.240.0.0 B. 255.248.0.0 C. 255.252.0.0 D. 255.254.0.0 E. 255.255.255.255

Description : You havea class A network address 10.0.0.0 with 40subnets,but arerequiredto add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should youassign? A. ... B. 255.248.0.0 C. 255.252.0.0 D. 255.254.0.0 E. 255.255.255.255

Last Answer : 255.254.0.0

If a Company require 60 hosts then What is the best possible subnet mask? a. 255.255.255.0 b. 255.255.255.192 c. 255.255.225.224 d. 225.225.255.240

Description : If a Company require 60 hosts then What is the best possible subnet mask? a. 255.255.255.0 b. 255.255.255.192 c. 255.255.225.224 d. 225.225.255.240

Last Answer : b. 255.255.255.192

A subnet has been assigned a subnet mask of 255.255.255.192. What is the maximum number of hosts that can belong to this subnet? a. 14 b. 30 c. 62 d. 126

Description : A subnet has been assigned a subnet mask of 255.255.255.192. What is the maximum number of hosts that can belong to this subnet? a. 14 b. 30 c. 62 d. 126

Last Answer : c. 62

What is IP class and number of sub- networks if the subnet mask is 255.224.0.0? a. Class A, 3 b. Class A, 8 c. Class B, 3 d. Class B, 32

Description : What is IP class and number of sub- networks if the subnet mask is 255.224.0.0? a. Class A, 3 b. Class A, 8 c. Class B, 3 d. Class B, 32

Last Answer : b. Class A, 8

You are given the IP address of 172.16.2.160 with a subnet mask of 255.255.0.0. What is the network address in binary? * 10101100 00010000 * 00000010 10100000 * 10101100 00000000 * 11100000 11110000

Description : You are given the IP address of 172.16.2.160 with a subnet mask of 255.255.0.0. What is the network address in binary? * 10101100 00010000 * 00000010 10100000 * 10101100 00000000 * 11100000 11110000

Last Answer : Correct answer: A To find the network address, convert the IP address to binary-10101100 000100000 00000010 10100000-then ANDed it with the subnet mask-11111111 11111111 00000000 00000000. The rest is ... that the class of an address can be determined by the numerical value of the first octet

hosts per subnet. What subnet mask will you use? * 255.255.255.248 * 255.255.255.128 * 255.255.255.192 * 255.255.255.240

Description : hosts per subnet. What subnet mask will you use? * 255.255.255.248 * 255.255.255.128 * 255.255.255.192 * 255.255.255.240

Last Answer : Correct answer: A By borrowing 5 bits from the last octet, you can. have 30 subnets. If you borrowed only 4 bits you could only have 14 subnets. The formula is (2 to the power of n)-2. By borrowing ... To get 20 subnets, you would need to borrow 5 bits so the subnet mask would be 255.255.255.248

Given the address 172.16.2.120 and the subnet mask of 255.255.255.0. How many hosts are available? * 254 * 510 * 126 * 16,372

Description : Given the address 172.16.2.120 and the subnet mask of 255.255.255.0. How many hosts are available? * 254 * 510 * 126 * 16,372

Last Answer : 254

You have an IP host address of 201.222.5.121 and a subnet mask of 255.255.255.248. What is the broadcast address? * 201.222.5.127 * 201.222.5.120 * 201.222.5.121 * 201.222.5.122

Description : You have an IP host address of 201.222.5.121 and a subnet mask of 255.255.255.248. What is the broadcast address? * 201.222.5.127 * 201.222.5.120 * 201.222.5.121 * 201.222.5.122

Last Answer : Correct answer: A The easiest way to calculate this is to subtract 255.255.255.248 (subnet mask) from 255.255.255.255, this equals 7. Convert the address 201.222.5.121 to binary- ... mask 255.255.255.248 to binary-11111111 11111111 11111111 11111000. AND them together to get: 11001001 1101111

You are given the following address: 15.16.193.6/21. Determine the subnet mask, address class, subnet address, and broadcast address. * 255.255.248.0, A, 15.16.192.0, 15.16.199.255 * 255.255.248.0, B, 15.16.192.0, 15.16.199.255 * 255.255.248.0, A, 15.16.199.255, 14.15.192.0 * 255.255.242.0, A, 15.16.192.0, 15.16.199.255

Description : You are given the following address: 15.16.193.6/21. Determine the subnet mask, address class, subnet address, and broadcast address. * 255.255.248.0, A, 15.16.192.0, 15.16.199.255 * 255.255.248.0, B, 15.16.192.0, ... 0, A, 15.16.199.255, 14.15.192.0 * 255.255.242.0, A, 15.16.192.0, 15.16.199.255

Last Answer : Correct answer: A,B & D Subnet addresses in this situation are all in multiples of 8. In this example, 201.222.5.16 is the subnet, 201.22.5.31 is the broadcast address. The rest are valid host IDs on subnet 201.222.5.16.

You are given the following address: 128.16.32.13/30. Determine the subnet mask, address class, subnet address, and broadcast address. * 255.255.255.252, B,128.16.32.12, 128.16.32.15 * 255.255.255.252, C,128.16.32.12, 128.16.32.15 * 255.255.255.252, B,128.16.32.15, 128.16.32.12 * 255.255.255.248, B,128.16.32.12, 128.16.32.15

Description : You are given the following address: 128.16.32.13/30. Determine the subnet mask, address class, subnet address, and broadcast address. * 255.255.255.252, B,128.16.32.12, 128.16.32.15 * 255.255.255.252, C,128.16.32.12 ... , B,128.16.32.15, 128.16.32.12 * 255.255.255.248, B,128.16.32.12, 128.16.32.15

Last Answer : Correct answer: A * 255.255.255.248,

You are given the following address: 153.50.6.27/25. Determine the subnet mask, address class, subnet address, and broadcast address. * 255.255.255.128, B,153.50.6.0, 153.50.6.127 * 255.255.255.128, C,153.50.6.0, 153.50.6.127 * 255.255.255.128, C,153.50.6.127, 153.50.6.0 * 255.255.255.224, C,153.50.6.0, 153.50.6.127

Description : You are given the following address: 153.50.6.27/25. Determine the subnet mask, address class, subnet address, and broadcast address. * 255.255.255.128, B,153.50.6.0, 153.50.6.127 * 255.255.255.128, C,153.50.6.0, 153 ... .128, C,153.50.6.127, 153.50.6.0 * 255.255.255.224, C,153.50.6.0, 153.50.6.127

Last Answer : Correct answer: A 255.255.255.224,

When configuring the subnet mask for an IP address, which formats can be used? * dotted-decimal. * Hexadecimal * Bit-count * Octal * Binary

Description : When configuring the subnet mask for an IP address, which formats can be used? * dotted-decimal. * Hexadecimal * Bit-count * Octal * Binary

Last Answer : Correct answer: A, B &C

………………….. implies that all subnets obtained from the same subnet mask. A) Static subnetting B) Dynamic subnetting C) Variable length subnetting D) Both B and C

Description : ………………….. implies that all subnets obtained from the same subnet mask. A) Static subnetting B) Dynamic subnetting C) Variable length subnetting D) Both B and C

Last Answer : A) Static subnetting

........ implies that all subnets obtained from the same network use the subnet mask. A) Static subnetting B) Dynamic Subnetting C) Variable length subnetting D) Both B and C

Description : ........ implies that all subnets obtained from the same network use the subnet mask. A) Static subnetting B) Dynamic Subnetting C) Variable length subnetting D) Both B and C

Last Answer : A) Static subnetting

............ implies that all subnets obtained from the same network use the subnet mask. A) Static subnetting B) Dynamic Subnetting C) Variable length subnetting D) Both B and C

Description : ............ implies that all subnets obtained from the same network use the subnet mask. A) Static subnetting B) Dynamic Subnetting C) Variable length subnetting D) Both B and C

Last Answer : A) Static subnetting

A network on the Internet has a subnet mask of 255.255.240.0. What is the maximum number of hosts it can handle ? (A) 1024 (B) 2048 (C) 4096 (D) 8192

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