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Domain 1.0 Network Technologies 20%
Domain 1.4: Proper Use of Addressing Technologies
Computer Networking
Undergraduate 4

Additional Computer Networking Flashcards





Subnetting allows you to create multiple logical networks that exist within a single Class A, B, or C network.


Class A addresses are for networks with a large number of hosts. The first octet is the netid and the 3 remaining octets are the hostid.


Class B addresses are used in medium to large networks with the first 2 octets making up the netid and the remaining 2 are the hostid.


Class C is for smaller networks with the first 3 octets making up the netid and the last octet comprising the hostid.

Default Subnet Masks
Class Default Subnet Subnets Hosts Per Subnet
Class A 126 16,777,214
Class B 16,384 65,534
Class C 2,097,152 254


Classful versus Classless addressing

Classful addressing works by dividing the IP address space into chunks of different sizes called classes.


Classless addressing is referred to as Classless Inter-Domain Routing (CIDR) and is done by allocating address space to Internet service providers and end users on any address bit boundary, instead of on 8-bit segments.


So does not have to use the standard subnet mask of which makes a Class B address space and which also puts it on the same network as using the subnet mask of Instead, by using classless addressing puts these systems on a different network than because the network names here are 172.16.50 and 172.16.51 which are different.


NAT stands for Network Address Translation and is a commonly used IP translation and mapping technology.


Using a device (such as a router) or piece of software that implements NAT allows an entire home or office network to share a single internet connection over a single IP address.


Port Address Translation is a feature of a network device that translates TCP or UDP communications made between hosts on a private network and hosts on a public network.


It allows a single public IP address to be used by many hosts on a private network.

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