Cisco Router Modes

1) User Exec Mode ( >)
2) Privileged Mode (#) which has as a subset, the Global Configuration mode and Specific Configuration mode

Global Configuration mode - To make changes globally.  (Config)#
Specific Configuration mode - Used to make specific configuration.  (Config-if)#

Routers

A router is a device that forwards data packets between computer networks, creating an overlay internetwork. A router is connected to two or more data lines from different networks.

Hardware routers are dedicated hardware that run special software created by their vendors to give them the routing capabilities, plus a whole lot more functions. Hardware routers a most common amongst companies as they are faster and more reliable. In the earlier days, hardware routers would start from a couple of hundred dollars, however their prices today are extremely low for cheaper-brand models.

Software routers perform similar tasks as the above hardware routers (route data), but they don't come in small flashy boxes. A software router could be an Windows , Linux or Novell NetWare server. All network servers have built-in routing capabilities.

More about Hub

Hub can only computers that belong to same network, it cannot connect computers of different network. Hubs are broadly classified into two types.

• Active
• Passive

Active Hub acts as a repeater to amplify the signals, whereas passive hub does not have that feature. So Active Hub will be used for transferring signal to long distance.

HUB

Hub is a physical device that connects computer in a Network. Hub is mostly used in Star network topology and it is connected by twisted pair cable which has the RJ45 connector.

Hub is called unintelligent device because it does not have capability of reading the destination IP address. When source system send a data to the destination system, the data is broadcasted to all connected in the network. Destination system alone will accept the data matching the MAC address where other system will reject the packet sent by Source system.

ISG Navigator - Definition

ISG Navigator is multi-tiered universal data access middleware that enables applications to access and manipulate data from multiple different data sources on both local and remote machines and across the Internet and intranets.

WiFi - Definition

Wi-Fi, which stands for wireless fidelity, in a play on the older term Hi-Fi, is a wireless networking technology used across the globe. In particular, it covers the various IEEE 802.11 technologies (including 802.11n, 802.11b, 802.11g, and 802.11a).

Wifi networks can either be "open", such that anyone can use them, or "closed", in which case a password is needed. An area blanketed in wireless access is often called a wireless hotspot.

Routing Protocol - Definition

A routing protocol is a protocol that specifies how routers communicate with each other to disseminate information that allows them to select routes between any two nodes on a network.

Routing Protocols are the software that allows routers to dynamically advertise and learn routes, determine which routes are available and which are the most efficient routes to a destination. Routing protocols used by the Internet Protocol suite