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  1.  What is the difference between a hub and a switch? Hub Switch Layer Physical layer. Hubs are classified as Layer 1 devices per the OSI model. Data Link Layer. Network switches operate at Layer 2 of the OSI model. Ports 4/12 ports Switch is multi port Bridge. 24/48 ports Device Type Passive Device (Without Software) Active Device (With Software) & Networking device Data Transmission form Electrical signal or bits Frame (L2 Switch) Frame & Packet (L3 switch) Transmission Type Hubs always perform frame flooding; may be unicast, multicast or broadcast First broadcast; then unicast & multicast as needed. Function To connect a network of personal computers together, they can be joined through a central hub.  Allow to connect multiple device and port can be manage, Vlan can create security also can apply Table  A network hub cannot learn or store MAC address.  A network switch stores MAC addresses in a lookup table. Transmission Mode Half duplex Full duplex Used in (LAN, MAN, WAN) LAN LAN Broadcast Domain Hub has one Broadcast Domain. Switch has one broadcast domain [unless VLAN implemented] Definition  An electronic device that connects many A network switch is a  Hub Switch network device together so that devices can exchange data computer networking device that is used to connect many devices together on a computer network. A switch is considered more advanced than a hub because a switch will on send msg to device that needs or request it Collisions Collisions occur commonly in setups using hubs. No collisions occur in a full-duplex switch. Spanning-Tree No Spanning-Tree Many Spanning-tree Possible Manufacturer s Sun Systems, Oracle and Cisco Cisco and D-link Juniper   2.  What is the significance of the IP address 255.255.255.255?  A special type of IP address is the limited broadcast  address 255.255.255.255 . A broadcast involves delivering a message from one sender to many recipients. Senders direct an IP broadcast to 255.255.255.255 to indicate all other nodes on the local network (LAN) should pick up that message. This broadcast is 'limited' in that it does not reach every node on the Internet, only nodes on the LAN. 3. What is OSPF? Open Shortest Path First  ( OSPF ) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system (AS). 4. What is difference between layer 2 Switch and Layer 3 Switch ? L-2 devices worked on mac address & L-3 devices worked on ip address. L-2 device more fast than the L-3 device. layer 2 is for peer to peer communication,layer 3 is for process to process commmunication  layer 2 switching routing is not possibel but layer 3 switch routing is possible 

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Jul 23, 2017
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