Q1. What is community address?
Solution: We can look at network and host addresses in two techniques:
one) Community-ID and Host-ID
An IP handle is made of two components, the left portion is community ID, the appropriate portion is host ID.
For instance, in a hundred.three.4.5, if a hundred is a network ID, then three.4.five is a host ID. If 100.three is community ID, then 4.five is a host ID.
2) Community-address and host-address. Let us seem at two examples:
IP-address Community-ID Host-ID Network-deal with Host-address Mask
one hundred.4.5.6/eight one hundred four.five.six a hundred… a hundred.four.5.six /eight
a hundred and fifty.1.2.three/sixteen a hundred and fifty.1 two.three one hundred fifty.one.. one hundred fifty.one.2.3 /sixteen
Be aware: Network mask is presented as /m where m is a two-digit decimal amount among 8~31.
Observe: IP, network, and host addresses are generally offered with masks.
Q2. What is mask?
Answer. IP employs community mask to break up a 32-bit IP-deal with into community-ID and host-ID. Network-handle is manufactured of community-ID bits on the left and bits on the correct.
For illustration, for a hundred and fifty.one.2.3/16, sixteen is the network mask, a hundred and fifty.one is network-ID, one hundred fifty.one../16 is community-tackle, two.three is host-ID, a hundred and fifty.one.2.3/16 is host-tackle. Network-deal with is utilized by routers to ahead packets. Host deal with is used to distinguish hosts in the identical network.
Q3. Why network addresses?
Reply: When quantities are way too several, we use hierarchical composition to control them. For example, telephone quantity are structured as.
For case in point, 086.021.1234.5678 is a variety in China, Shanghais. The voice concept is switched by country code, metropolis code, and prefix. Structured mobile phone quantities are much less difficult to swap than flat 10-digit cellphone numbers.
Internet faces a comparable predicament. There are almost four.two billion addresses (IP has 32 bits. or two^32 specific addresses.) Routers use routing tables to foreword packets. Obviously, it is much less complicated for router to deal with structured addresses than 4 billion flat ones.
IP’s solution is to use community-addresses to ahead packets, not individual ones. Network mask breaks an address into a network-ID and a host-ID. check my public ip address use network addresses, not IP addresses.
For case in point,
– one hundred…/8 network has sixteen,777,216 addresses. In a routing desk, (one hundred…/eight, next hop interface) suggests: ahead packets with the same location community to the same next hop interface.
– 150.one../16 community has 65,536 addresses. In a routing desk, (one hundred fifty.1../sixteen, next hop interface) normally takes treatment of forwarding sixty five,536 personal addresses in 150.one../16 network.
– one hundred fifty.1../sixteen community has sixty five,536 IP addresses. In a routing desk, (150.1../sixteen, subsequent hop interface) takes care of forwarding 65,536 individual tackle in a hundred and fifty.1../16 community.
– 222.111.44./24 has 256 IP addresses. In a routing desk, (222.111.forty four./24, subsequent hop interface) forwards 256 IP addresses in 222.111.forty four. network to the following hop interface.
This fall. How existing mask in decimal?
Solution. Existing mask the very same way as IP address. For illustration.
/eight is offered as 255….
/sixteen is introduced as 255.255…
/24 is offered as 255.255.255.
Q5. Why mask size is multiple of 8 but?
Solution: There are two kind of IP addressing strategies: classful and classless. What we have talked so much is classful. Classless IP handle can use mask of any length. See subsequent tutorials for details.
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