Nowadays, many people use the router to access the Internet. However, for the novice rookie, what is the role of this router is not very clear, and there is something to listen to people say "cat". What is the difference between this cat and the router ? Xiao Bian has compiled some information and we understand the following:
What is a router?
A router is a device that connects to various LANs and WANs in the Internet. It automatically selects and sets routes based on the conditions of the channel, and sends the signals to the device in the best path. The router is the hub of the Internet. Policemen".
The advantages and disadvantages of the router
1 advantages
Suitable for large-scale networks; complex network topology, load sharing and optimal path; better handling of multimedia; high security; isolation of unwanted traffic; saving LAN bandwidth; reducing host burden.
2. The disadvantage
It does not support non-routable protocols; it is complex to install; it is expensive.
What is the role of the router?
As a hub connecting different networks, the router system forms the main thread of the Internet based on TCP/IP Internet. It can also be said that routers constitute the skeleton of the Internet. In the campus network, area network, and even the entire Internet research field, router technology has always been at the core position. Its development history and direction have become a microcosm of the entire Internet research.
The function of the router
(1) The packets sent to the remote network segment are captured between the networks and used as forwarding.
(2) Choose the most reasonable route to guide communication. In order to achieve this function, the router should look for the routing table according to a certain routing communication protocol. The routing table lists the various nodes contained in the entire internetwork, as well as the path between the nodes and the transmission costs associated with them. If there is more than one path to a particular node, the optimal (most economical) path is selected based on predetermined criteria. As various network segments and their interconnections may change, the routing information needs to be updated in a timely manner. This is accomplished by the periodic update of the routing information protocol used or the updating according to changes. Each router in the network dynamically updates its maintained routing table according to this rule in order to maintain valid routing information.
(3) In the process of forwarding packets, the router breaks large packets into packets of appropriate size in order to facilitate the transmission of packets between the networks. After reaching the destination, the packets are packaged into original packets. There is form.
(4) Multi-protocol routers can connect network segments using different communication protocols as a platform for communication connection between different communication protocol network segments.
(5) The main task of the router is to direct traffic to the destination network and then to a specific node station address. The latter function is done through network address resolution. For example, the assignment of the network address portion is designated as a set of nodes for the network, subnet, and area, and the remainder is used to specify the particular station in the subnet. Hierarchical addressing allows the router to store the location information for networks with many sites.
The difference between cats and routers
What is a cat?
The cat is called a modem and the computer can use it to dial up. Connect the telephone line above and the router below.
Cats and routers are the same: they are all on the Internet.
The difference between cats and routers:
Exterior:
Cats have at least two ports: one for the telephone line and one for the RJ-45 port (network cable)
The router is generally a kind of port: RJ-45 but an external network, a local area network
use:
Cats are used to transfer signals from different media in the network, such as converting ADSL, fiber optic, and wireline network signals into standard computer network signals.
Routers are used for the redistribution of network signals. Simply put, a network cable can connect more computers.
Editing summary: Simply put, cats are equivalent to packing factories, routers are equivalent to wholesale and retailers, and switches are equivalent to logistics and distribution. Therefore, if you have broadband at home, you must have a cat. If you have more than one computer, you must use a router to access the Internet. If there are many computers, the number of interfaces that exceed the router needs an expansion interface. The relevant information about the difference between the cat and the router is introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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