IP/Subnetting Flashcards
What does this mean /XX
CIDR - Classless Inter-Domain Routing or super netting
Inside local address
The IP address assigned to a host on the inside network. This is the address configured as a parameter of the computer OS or received via dynamic address allocation protocols such as DHCP. The address is likely not a legitimate IP address assigned by the Network Information Center (NIC) or service provider.
Inside global address
A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world.
Outside local address
The IP address of an outside host as it appears to the inside network. Not necessarily a legitimate address, it is allocated from an address space routable on the inside.
Outside global address
The IP address assigned to a host on the outside network by the host owner. The address is allocated from a globally routable address or network space.
How many IP Address classes are there.
5
What is the Class A Range?
What is the default network mask.
- X.X.X - 126.X.X.X
255. 0.0.0
What is the Class B Range?
What is the default network mask.
- 0.X.X-191.255.X.X
255. 255.0.0
What is the Class C Range?
What is the default network mask.
- 0.0.X-223.255.255X
255. 255.255.0.0
What is the Class D Range?
What is the default network mask.
224.0.0.0-239.255.255.255
No mask used for multcating
What is the Class E Range?
What is the default network mask.
240.0.0.0-255.255.255.255
No mask used for research
What is 0.0.0.0 used for?
is a non-routable address used to designate an invalid, unknown or non applicable target.
Loopback address
127.X.X.X.
How many private IP ranges are there.
4
Class A private range
10.0.0.0 - 10.255.255.255
Class B private range
- 16.0.0 - 172.31.255.255
169. 254.0.0-169.254.255.255
Class C private range
192.168.0.0-192.168.255.255
What is a Subnet Mask
used to determine where the network ends and the hosts begins.
Formula for finding the number of host
2 ^ # of 0 in the host bits.
Formula for assignable host
2^ # of 0 in the host bits -2.
Formula for number of subnets
2 ^ # 1 in last subnet mask.
or 256 - netmask
Where is the broadcast in a network
The last host address
Formula for finding the network ID
Doing a bit wise AND on the last subnet mask and IP.
Formula for the first usable host
network ID + 1
Formula for the last usable host
broadcast ID - 1
Create a subnet chart
- Create a grid with 3 columns 14 rows.
- label the columns: Bits Block Size/Exponents, and Decimal Mask Value
- For bits begin at the top with 0 and go to 12
- For Block Size/Exponent start at the top with 1 and double.
- For the Decimal value column, start at the row that corresponds with block 128 enter 128. For each row going up add the value from the row above block size.
https: //youtu.be/nVPmCGWokmc
How many components are in a IP packet
12
With 1 options
List all components of the IP version 4 packet format
Version Header Length Priority & Type of service Total length identification flags framented offset TTL protocol header checksum source IP Destination IP *Options
Automatic Private Ip address
169.254.0.0-169.254.255.255
How to find the max subnets
- Look at the IP address determine its classful mask
2. Include the 1’s after the classful mask in your count of number of subnets.
How to find the max host
- look at the Ip address determine its classful mask
2. Count the number of 0 -2
Wilcard mask
Is the inverse of the NETWORK mask. and is use to filter or allow data on a cisco router.
subtract the network mask by 255.255.255.255
