Shulou(Shulou.com)06/01 Report--

The router works in the three layers of the network layer. it is a device that connects each local area network and wide area network in the network and is used to forward signals between different network segments.

How the router works: based on the source does not learn, based on the routing table forwarding, no table will be discarded.

Different interfaces of the router assign different network segments, and the router divides the network and the broadcast domain.

The interface of the router is turned off by default and needs to be turned on manually.

Router management and configuration:

V Console interface: the administrator can manage and configure the router through the Console port. Console is the serial port. If you want to connect the PC, you need to transfer the serial port to the USB port. The PC can be managed by connecting the Console through the SecureCRT tool. The baud rate of the serial port is 9600.

V Telnet remote: the administrator can also configure the router through network remote management through the Telnet protocol, but only if the network is interconnected and the switch is configured with VTY.

V WEB management: many routers have integrated WEB page management, we can manage and configure the router through the WEB page.

Router classification:

V Home router: simple and convenient configuration, low forwarding efficiency, generally can support 30 to 60 PC connection forwarding.

V enterprise router: command line configuration is complex, forwarding efficiency is high, and generally supports hundreds of devices to connect and forward.

V Wireless routing: a router with wireless functions. Wireless protocols are: WIFI,3G,4G.

Router brands: CISO Cisco, Huawei, H3C, etc.

The firewall is a device that works in the four layers of the transport layer, and its function is mainly for security. We can control the Internet behavior of the network through the firewall, such as network monitoring, packet filtering, traffic speed limit, and specify firewall rules.

Firewall classification:

V software firewall: based on IOS system, it is an application function of IOS system.

V hardware firewall: physical firewall, more powerful, less loopholes.

Firewall brand: Shenxin, Cisco ASA, Huawei, juniper, Tianrongxin, etc.

Cisco firewall is mainly used with other devices of the same brand with a high degree of integration. We are convinced that the firewall is designed for the application layer and is easy to use.

Hardware firewall vendor advantages:

CISCO: integrated firewall can be used with other CISCO devices

Convinced: when users access resources through × ×, the resources will be cached locally, which will improve the efficiency of next user access.

Juniper: high connection throughput

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