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

Routing - Definition

Routing (or routeing - UK English) is the process of selecting paths in a network along which to send network traffic.

DHCP - Definition

Dynamic Host Configuration Protocol an Internet protocol for automating the configuration of computers that use TCP/IP. DHCP can be used to automatically assign IP addresses, to deliver TCP/IP stack configuration parameters such as the subnet mask and default router, and to provide other configuration information such as the addresses for printer, time and news servers.

Subnetting - Definition

Subnetting is to break the network into smaller segments or subnets. Subnetting is done for various reasons, including organization, use of different physical media (such as Ethernet, FDDI, WAN, etc.), preservation of address space and security.

Subnet Mask - Definition

Subnet Mask is used to identify the Host ID and the Network ID of the IP address. Class of the IP address cannot be identified using the Subnet Mask.

Types of IP Address

IP Address is classified into types based on its range.

• Class A - Range 1 to 126
• Class B - Range 128 to 191 (127 is the loop back address)
  
• Class C - Range 192 to 223
• Class D - Range 224 to 239
• Class E - Range 240 to 255

Class A, B and C are used for Unicast, Class D is used for Multicasting and Class E is used for Research.

IP Adress - Definition

IP(Internet Protocol) is the unique address assigned to every computer that is connected to internet. You can identify a particular computer connected to the network by using its IP Address.

There are two types of IP address,

• IP Address v4 - 32 bit
• IP Address v6 - 128 bit.

IP Address has two parts,

• Host ID
• Network ID