Comprehensive Understanding of router interfaces and connections (1)

The network location of a vro is complex. It can be an internal subnet edge or an internal or external network edge. At the same time, to achieve strong applicability, it needs to connect to a variety of networks, so that its interfaces must be diverse. Not to mention network enthusiasts, but many network administrators cannot make it clear. To this end, I would like to introduce all kinds of interfaces and Connection Methods of routers.

I. router interface

A vro has powerful network connection and routing functions. It can be physically connected to a variety of different networks, which makes the router interface technology very complex, the more upscale a router has more interface types, because the more network types it can connect. Vro ports include LAN ports, WAN ports, and configuration ports.

1. LAN interface

Common Ethernet interfaces include AUI, BNC and RJ-45 interfaces, as well as FDDI, ATM, Gigabit Ethernet and so on all have corresponding network interfaces, the following describes the main LAN interfaces.

1) AUI Port

The AUI port is the interface used to connect to the coarse coaxial cable. It is a "D" Type 15-pin interface, this is one of the most common ports in the ring or bus network. The router can connect to the 10Base-5 network through a coarse coaxial cable transceiver. But more is the use of external transceiver AUI-to-RJ-45), to achieve the connection with the 10Base-T Ethernet. Of course, you can also use other types of transceiver to connect to the 10 base-2) or 10 base-f sub-coaxial cable. AUI interface 1.

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2). RJ-45 Port

RJ-45 port is our most common port, it is our common twisted pair Ethernet port. Because in Fast Ethernet also mainly uses twisted pair as transmission medium, according to the port communication rate of different RJ-45 port can be divided into 10Base-T network RJ-45 port and 100Base-TX network RJ-45 port two types. Among them, the RJ-45 port of the 10Base-T network is usually identified as "ETH" in the router, while the RJ-45 port of the 100Base-TX network is usually identified as "10/100 bTX ".

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2 shows the 10Base-T network RJ-45 port, and 3 shows the 10/100 Base-TX network RJ-45 port. In fact, the two kinds of RJ-45 port is completely the same as the port itself, but the corresponding network circuit structure in the port is different, so it cannot be casually connected.

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3). SC Port

The SC port is also known as an optical fiber port. It is used to connect to the optical fiber. An optical fiber port is usually used to connect to a vswitch with an optical fiber port, instead of directly connecting to a workstation using a optical fiber. Instead, it is connected to a vswitch with a optical fiber port, such as a fast Ethernet or Gigabit Ethernet. These ports are generally available in high-end routers and are marked with "B FX", as shown in figure 4.

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2. WAN Interface

As mentioned above, vrouters can not only achieve the connection between the LAN, but also the connection between the LAN and the Wan, and between the WAN. However, because the wide area network is large and the network environment is complex, the speed requirement of the port used by the router to connect to the wide area network is very high. In Ethernet, the speed requirement is generally above Mbps Fast Ethernet. The following describes several common Wan interfaces.

1). RJ-45 Port

The RJ-45 port can also be used to establish a connection between the WAN and lan vlan Virtual LAN) and to the remote network or the Internet. If you use a router to provide routes for different VLANs, you can directly connect to different VLAN ports using twisted pair wires. But pay attention to here the RJ-45 port connected to the network is generally not very can be 10Base-T this, generally is more than Mbps Fast Ethernet. If you need to connect to a remote network through optical fiber, or connect to other types of ports, you need to use the transceiver to connect to each other. 5 is the Fast Ethernet port.

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