Routers connect different computer networks and forward data packets between them by reading the address information in each packet to determine the ultimate destination. A router contains a routing table with information about connected networks and uses this to determine the best path for packets to travel through multiple networks to reach their destination. There are two main types of routers: core routers connect different cities while edge routers connect users and hosts to networks.

1. Prepared by:
Dheeraj Pathak
JNU,JAIPUR

2.  Router is a device which connects different
networks-frequently over a large distances.
 A router is a device that forwards data packets
between computer networks, creating an overlay
internetwork.

3.  A router is connected to two or more data lines
from different networks. When a data packet comes
in on one of the lines, the router reads the address
information in the packet to determine its ultimate
destination.
 A data packet is typically forwarded from one
router to another through the networks that
constitute the internetwork until it gets to its
destination node.
 It contains a routing table in which all information
about the address of connected networks.

5. Router Internal Components
Console
Auxiliary Interfaces
RAM NVRAM Flash ROM
RAM - Packet buffers, running configurations, running IOS
ROM - Rom Monitor, Baby IOS (Rxboot)
NVRAM - Backup configurations, Config register
Flash - IOS

7. There are two types of router :
Core router:
 core router is used to connect different cities.
 CISCO 12000 series is ex. of core router.
Provide EDGE router:
 this router is used to connect users/hosts.
 CISCO 7600 series is ex. of provide EDGE router.

8.  Router limits the collision domain.
 Router can function on LAN & WAN
 Router can connects different media&
architectures.
 Router can determine best path/route for data to
reach the destination.
 Router can filter the broadcasts.

9.  Router is more expensive than Hub, Bridge &
Switch.
 Router only works with routable protocol.
 Routing updates consume bandwidth.
 Increase latency due to greater degree of packet
filtering.

10. Thank You!!