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Network security, convergence, network management, internet and intranet design, configuration and optimization of routers and switches, centralized data storage and management for large-scale environments, and in-depth knowledge of one or more NOSs.
New routers have advanced firewall features capable of blocking most security threats.
Some recommended books about Cisco routers are: Cisco Router Configuration, Cisco Routers For The Desperate, Cisco Routers for IP Router, Cisco CCNA Routing and Switching.
If you want to protect your computer, yes you need a firewall. Firewall which comes with routers will not protect you from more sophisticated internet attacks.
If you are looking to active your firewall on a router, go into your router administration panel. Find the routers firewall tab and make sure it is enabled.
Routers usually, if not always, include a firewall. This is the only device I know of.
Setup Mode
firewall
All routers provide good hardware firewalls using stateful packet inspection (SPI), but Buffalo routers are excellent in this regard.
Many routers come with hardware support built in to protect your connection from those attempting to hack or disrupt your service. Many netgear routers come with firewall support built in, as do buffalo and D link router equipment.
Routers are devices used to deliver information to a computer from the internet. They can also be used to connect two computers to each other, forming an intranet.
The 192.168.4.0 network is not included in the RIP configuration of R2.