Section 4 : Networking Devices

Question 1

What is a Network Interface Card (NIC)?

Answer 1

• The network adapter installed on your network device
• Provides the physcial and electrical, light or radio frequency connections to the network media
• It can etiher be an expansion card, used devices or built directly into the motherboard

Question 2

What is a Network Hub?

Answer 2

• Used to connect devices together in a network.
• Used in early Networks; replaced by Switches.
• “Multi-Port Repeater”
  
  • Traffic goes in one port and is repeated out every other port
  • OSI Layer 1 device
  • Dumb Network Device
• Much less efficient than a switch

Question 3

What is a Network Switch?

Answer 3

• Connects devices together just like a Hub.
• Intelligent network device.
• Memorizes the MAC Address of each device connected to it via MAC Address Table.
• Pays attention to Source and Destination MAC addresses during communication process.
• Traffic goes into One port and is repeated out to only Destination Port
• Designed for High Bandwidth

Question 4

Hub VS Switch?

Answer 4

Hub:

• Dumb device
• Floods all ports
• OSI Layer 1 device
• Less secure
• Collisions more frequent

Switch:

• Intelligent device
• Learns ports by MAC Address
• Only sends to specified port
• OSI Layer 2 device
• More Secure
• Colision less frequent

Question 5

What is Wireless Access Point(WAP)?

Answer 5

• WAP is a Bridge
• Allows mobile users to connect to a wired Network wirelessly
• Uses 802.11 standard
  
  • Encryption (WEP,WPA,WPA2)

Question 6

What is a Network Router?

Answer 6

• Used to connect different networks together.
• Routes traffic between networks using IP Addresses.
• Uses Intelligent decisions (Routing Protocols) to find the best way to get a packet of information from one network to another.
• OSI Layer 3 device

Question 7

What is a Network Firewall?

Answer 7

• Protects your LAN from Malicious activity on the Internet
• Prevents unwanted network traffic on different networks from accessing your network and vice versa
• Controls the flow of information in and out of your network
• You create networt access rules sets to setup and maintain a firewall.
• A Firewall can be s standalone network device or Software on a computer.

Question 8

What us a Network DHCP Server?

Answer 8

• Dynamic Host Configuration Protocol(DHCP) Server.
• Automatically assigns IP Addresses to hosts.
• makes administering a network much easier.
• The alternative is Static IP Address.

https://www.youtube.com/watch?v=e6-TaH5bkjo