Module 8 Flashcards
How many bits in length are IPv4 addresses?
32 bits in length.
IPv4 addresses are 32 bits in length. To make them easier to read, they are grouped into _-___ bytes called ______.
Into four 8-bit bytes called octets, like this:
11010001.10100101.11001000.00000001
To make IPv4 addresses easier to read, each octet is converted into ______ _______ ______________.
dotted-decimal representation:
209.165.200.1
What does the netmask 255.255.0.0 tell you about an IP address?
It tells you that only the first 16 bits (or 2 octets) define the network address, and that the remaining 16 bits (or 2 octets) are the host address/host identifier.
What is the point of a netmask?
A netmask really is just a way to declare a point along the line from left to right where we say, “okay from here on we’re referring to the individual host, rather than the network.”
But also remember that net masks are obsolete for new/modern devices, having been replaced by CIDR routing (which honestly is much easier to use).
What does a netmask of 255.255.255.0 tell you?
This netmask will match all the IP addresses that share the first 3 octets - so a message with this netmask will go to all the clients connected to the network.
What would a subnet mask of 0.0.0.0 tell you?
This address will match any and all addresses. In the whole world. Technically it’s an invalid mask for a specific IP range.
What does the address 192.168.5.1/24 tell you?
That the first 24 bits are the network address, and the remaining 8 are the host identifier.
Is the address 192.168.5.1/24 an IP address?
The part before the / is the IP address, and the part after the / is the CIDR address (the next generation of subnet mask!).
What does CIDR stand for?
Classless Inter-Domain Routing.
What does VLSM stand for?
Variable Length Subnet Masking.
