5A

Question 1

Subnets is short for what?

Answer 1

Subnetworks

Question 2

A ____ then, is a logical division of a network of connected network
devices based on the IP address.

Answer 2

Subnet

Question 3

A subnet is a separate and identifiable portion of an organization’s
network, typically arranged on one floor, building or geographical location. Consider a subnet a…?

Answer 3

network within a network

Question 4

Each device on each subnet has an IP address that logically associates it with the others on the same subnet. This also prevents devices on one subnet from getting confused with hosts on the other subnet. In terms of IP addressing and subnets, these devices are referred to as ____.

Answer 4

hosts

Question 5

So, in our example, there is a ____ (the company), which is divided into ___ ___ (marketing and sales departments), each of which has its own ____ (users and printers).

Answer 5

network
logical subnets
hosts

Question 6

To subnet a network is to create ___ ___ of the network.

Answer 6

logical divisions

Question 7

Subnetting, therefore, involves dividing the network into smaller portions called ____.

Answer 7

subnets

Question 8

Subnetting applies to __ ____ because this is done by borrowing bits from the host portion of the IP address.

Answer 8

IP addresses

Question 9

In a sense, the IP address then has three components - the ____ part, the ____ part and, finally, the ____ part.

Answer 9

network part
subnet part
host part

Question 10

We create a subnet by logically grabbing the ____ ____ from the network component of the address and using it to determine the number of subnets required.

Answer 10

last bit

Question 11

Class C address normally has 24 bits for the network address and eight for the host, but we are going to borrow the ____-____ bit of
the host address and declare it as identifying the subnet.

Answer 11

left-most

Question 12

If the bit is a 0, then that will be one subnet; if the bit is a 1 that would be the ___ subnet.

Answer 12

second

Question 13

A subnet mask is a __-___ number used to differentiate the network component of an IP address by dividing the IP address into a network address and host address.

Answer 13

32-bit number

Question 14

All that a subnet mask does is indicate how many bits are being
“____” from the host component of an IP address. If you can’t remember anything about subnetting, remember this concept. It is the foundation of all subnetting.

Answer 14

borrowed

Question 15

The reason a subnet mask has this name is that it literally ___ ___ the host bits being borrowed from the host address portion of the IP address.

Answer 15

masks out

Question 16

The /25 is a format known as…?

Answer 16

ClDR

Question 17

What does CIDR stand for?

Answer 17

Classless Internet Domain Routing

Question 18

IP addresses classes are not ___ ___ other than to understand the basic concepts of IP addressing.

Answer 18

used anymore

Question 19

Instead, Classless Internet Domain Routing (CIDR), pronounced “___”, is used to represent IP addresses.

Answer 19

cider

Question 20

The idea behind CIDR is to adapt the concept of subnetting to the ___ ___.

Answer 20

entire internet

Question 21

In short, classless addressing means that instead of breaking a particular network into subnets, we can aggregate networks into larger ____.

Answer 21

supernets

Question 22

CIDR is therefore often referred to as ______, where the principles of subnetting are applied to larger networks.

Answer 22

supernetting

Question 23

CIDR is written out in a ___/___ format, where the mask is tacked onto the network address in the form of the number of bits used in the mask. An example would be 205.112.45.60/25.

Answer 23

network/mask

Question 24

What is most important to understand about the CIDR method of subnetting is the use the ___ ___ (the /25 of 205.112.45.60/25), rather than the classful way of using the first three bits of the IP address to determine the dividing point between the network number and the host number.

Answer 24

network prefix

Question 25

So why use CIDR? Because it’s a much more ____ ____ of the IP address space. Using CIDR, a network admin can carve out several host addresses that’s closer to what is required than with the class approach.

Answer 25

efficient allocator

Question 26

When an IP network is assigned more than one subnet mask, it is said to a have a…?

Answer 26

VLSM

Question 27

What does VLSM stand for?

Answer 27

Variable Length Subnet Mask

Question 28

This is what is used when you are subnetting a subnet. The concept is very straightforward: Any one subnet can be broken down into further subnets by indicating the proper ____.

Answer 28

VLSM

Question 29

This makes IP addressing more efficient by allowing each subnet to have a different number of hosts. This results in reducing the number of ___ ___.

Answer 29

wasted addresses

Question 30

Up to ____ Available Subnets per class A address.

Answer 30

8,388,608

Question 31

Provides most available subnets because class _ has
more host bits to borrow from.

Answer 31

Class A

Question 32

Up to _____ available subnets per class B address.

Answer 32

32,768

Question 33

Is a Classless Inter-Domain Routing replaced antiquated classful
routing.

Answer 33

CIDR

Question 34

The relevance of this is that RIP1 only allows a ___ ___ ___, making it impossible to get the full benefit of VLSM. You must use a newer routing protocol like Open Shortest Path First (OSPF) or RIP2, where the network prefix length or mask value is sent along with route advertisements from router to router. With these in use, it is possible to use VLSM to its full potential and have more than one subnet or sub-subnets.

Answer 34

single subnet mask

Question 35

Designing and setting up a simple network isn’t complicated. It is based on two things; how many ____ needed and/or how many ____ needed for the subnet.

Answer 35

subnets and hosts needed