【 Weak current College 】 all see through home router out purchase mistakes

Speaking of the router's Internet principles, many users still do not quite understand. Now, we as a people and detailed introduction to the router, to the reader a Visual perspective, pointing you to identify the router.

What is a router:

Must have a clear picture of the router, among the first to understand what is routed. The so-called "Routing", is resolved to the mutual convergence of networks, data information from a source location to the destination point, while the router is the implementation of such transfer behavior of tools, its English title is the Router that is used for connecting multiple networks or segment of network equipment. The router can be not the same network or network segment between the information to perform in-line and the "translation", so that these are not the same network or network segments can be mutually "read" and understand each other's data, thus the formation of a larger network, complete the different networks or interconnection between network segments.

The router's appearance:

Resolved that the above description, I used to have the router a preliminary remarks, the next we to TP-LINK router, for example, to really take a look at the appearance of the router to router has a more intuitive to understand. Now, the market common router normal are plastic casing, models are simple analogy, the fuselage is divided into the first Panel and rear panel. First Panel is used to indicate that the led is equipped with a task form, in sequence from left to right is the M1, M2, 4 LAN ports for LEDs and WAN port LEDs.

The fuselage of the back panel provides a cohesive leadership network is equipped with 10/100 m automatic conforming to the Ethernet interface (WAN), four for convergence in the computer's 10/100 m automatic conforming to the Ethernet (LAN) interface.

The primary function of the parameters of the router:

Since its inception in the early 1980s, the gradual growth so far, the router its purpose and functions has been considerably expanded and strengthened. Now the router has a function has more and more lucrative, DDNS, NAT, VPN, etc. On some of the first router users, see the term almost always is to see, how to get bought router and carry forward its due role? the following net-man some of on that router more function arguments to the reader to make a brief, hope to have a first look at the router's user assistance.

CPU

As with the computer, router also includes a central processor, which is the CPU, which is composed of the most central router. Not the same series, different types of routers, which are not the same CPU. Processors have a direct impact on the router throughput (routing table lookup time) and route calculation competence (impact network routing convergence time). General terms, the processor clock speed at 100M or less is low frequency, the low-end routers for home and SOHO users. 100M to 200M 200M belonging to medium frequency, a clock speed above you, and suitable for net bar, SME user, as well as large enterprises of the branch organizations.

Memory

Router can have a variety of memory, now the router normal is read-only memory (ROM), random access memory (RAM), non-volatile RAM (NVRAM) and Flash (Flash) four different types of memory, each memory to different ways to assist the router task. Memory used to store configuration, router operating system, routing, protocol software, and other content. In low-end routers, routing table can be stored in memory. Usually, the more memory the better router, but efficient algorithms and the excellent software may also be enough significant waste of memory.

Memory can be used Byte (bytes), you can also do enough Bit (bit) units, a tone, but eight times the difference between the capacity (1Byte = 8Bit). Now the router memory 1M to low, 4MBytes belonging to belong to the Middle, 16MBytes 8MBytes or above are examples of large memory.

Throughput
The data in the network is composed by one packet, for every packet processing consumes resources. Throughput is not loss of the unit of time that the number of packets, that is equipped with a full set of packets forwarded talents, is equipped with the function of the main objectives. Router throughput represents a router per second can handle the data volumes, is a router function intuitively.

Supported network protocols

Just like people speak some words, on the network, each computer also has a Word, this is the network protocol, not the same as the computer necessary to adhere to the same network protocol competence to perform communication. Many of the protocols: TCP/IP, IPX/SPX protocol, NetBEUI protocol, and so on. In LAN is used the analogy of an IPX/SPX. Users assume that access to the Internet, you must add the network protocol in the TCP/IP protocol.

Wire-speed forwarding ability

The so-called wire-speed forward competence, on arrival at port maximum rate from the sky, router the data transmitted is not lost packets. The most basic and the router's main function is the packet forwarding, in the same port forwards the packet rate is on the router packet forwarding able greatest test of full-wire speed forward competence refers to the minimum packet length (Ethernet 64 bytes, POS mouth 40 byte) and minimum packet intervals (agreement protocol rules) in the router port bidirectional transmission at the same time not stir up packet loss.　　Wire-speed forward is one of the main function of the router. Easy to say that it is in much of the traffic went much traffic, and will not be processed due to the calibre of questions with a lower throughput. Machine number

With a good understanding of the number of machines is the router cannot load the number of computers. In the factoryCommercial introduction of function parameters table often can see nominal own router can bring 200 PCs, 300 PCs, but many small router performance and nominal values are very different. This is because the router machine number directly affected by the practice environment network busy level, not the same as the number of network environment with varied widely.

For example, in the Internet, almost all of the people at the same time in Internet chat, play games, watch a movie, these data have to be resolved, the router's WAN port load is very heavy. While the Internet is often the same time only need small local people in the use of the network, the router load is light. Thus one can bring 200 PCs of routers in the enterprise network, the Internet can even bring 50 PCs. Budget a network each PC average data traffic is not so precise.

Router advanced functions:

Now the market large local routers extends VPN, firewall, DMZ, support for virtual server, supports static DNS and other advanced functions, we will work together to look at the advanced functions of these routers are able to play some role.

MAC address function

The MAC address is curable in card serial EEPROM's physical address, also known as hardware address or link address, by network equipment manufacturers is written in the hardware. MAC address and the network didn't gateway and required level consistent with the hardware, and more based on Physics for easy identification. With the MAC address of the function of the router can be the MAC address on the network card, so that the server is written to resolve the access time of MAC address validation for broadband access.

MAC address configuration, there are two uses, you can resolve it to set the permission may stop which computers can access the Internet, the router may also be enough use Mac address function bound IP address, use a user each time they log on to the network have access to the same IP address.

Static host configuration protocol (DHCP) function

Static host configuration protocol (DHCP) is a network maintenance can center maintenance and automatically assigned IP network address of the communication protocols. IP network, each Internet-equipped with all necessary to assign unique IP addresses. When a computer is connected to the network is not the same location, the DHCP network maintenance can be allocated from the central monitoring and the IP address of the computer and automatically sends its new IP address. DHCP automatically assigns IP addresses to log in to the TCP/IP network clients mission station. Static host configuration protocol function can provide safe, secure, easy network configuration to prevent address conflicts with.

Virtual private network (VPN) function

Virtual private network is set up on the public network for network technology. Easy to say, a virtual private network provides users with a resolution of the public network is safe to use on the internal network to perform remote access interface. VPN Internet public network cannot be used to establish a network of individual autonomy, a secure VPN tunnel, encryption, include authentication, access control and auditing techniques. This function to ensure the enterprise user's information security is key.

DMZ function

DMZ is the English acronym for "demilitarizedzone", the Chinese title of the "quarantine", also known as the "demilitarized zone". You can learn as a difference to the extranet or intranet's special

Network zone, used to place the number does not contain confidential information of the public server, such as Web, Mail, FTP, etc. This comes from outside the network's visitors can access DMZ service, but do not have access to the storage, network the company confidential or personal information, etc. Even the DMZ server is compromised, or internal network formation affect of secret information. Now the market large local router had to pick up a single PC DMZ functions, there are also some function more complete router can be configured with multiple PCs on DMZ functions. The user can perform based on the practice of requiring detailed purchase.

DDNS function, DDNS is the abbreviation for a static domain name service, DDNS is user of static IP addresses are mapped to a fixed domain name analysis of the service, the user interface of the network each time the client order meeting summary information is passed to the host of the static IP address to host the service provider's server order, service order as item for providing DNS service and complete analysis of the static field name. The primary role of the DDNS function is, on the one hand, broadband operators are mostly only provides a static IP address, DDNS can capture each time the user changes the IP address, and then associate it with a domain name, so that other Internet users can resolve domain names to communicate with the user. On the other hand, can assist the user in the DDNS own company or home construction Web hosting to your own domain name makes known information.

Firewall functions

The so-called "firewall", refers to an internal network and the masses access network (such as Internet) separate method, which in practice is a kind of isolation technology. A firewall is in two network communication implementation of an access control measure, it can permit you to "endorse", and data access to your network, you do not agree "," people and data away, a maximum limit to prevent the network from hackers to access your network. In other words, if not resolved to the firewall, in-house people cannot access the Internet, the Internet one can and those who perform within the company.

Use the router firewall function can flow through the router to perform the scan of the network data to filter out some attack information, you can close the port is not often used, to reduce the hacker attacks. In addition, the firewall can prevent a specific port to stop the flow of information from the special site。

Summary:

Resolved that the above description, I believe the masses on the router has been required to understand the views, needs and that the user should not blindly pursuing various extensions for routers, must be from its own practice started picking their own need for a router. Just such a competence of the router to best carry forward.