1.1 Sample CCNA exam (Describe how a network works)

This sample CCNA exam intend to review your knowledge about segment 1.1 Describe the purpose and functions of various network devices on Cisco CCNA 640-802 exam blue print. So, did you know already ?

Questions :

1. What is biggest benefit of using switch instead hub for network connectivity in LAN ?
2. Explain true characteristics regarding the use of hubs and switches ..
3. Mention functions of a router ..
4. Network devices : switch, hub, bridge, and repeater. Categorise those network devices based on what OSI layer they operate ..
5. Giving device capabilities : Allowing simultaneous frame transmissions and Filtering frames based on MAC addresses. What device has both capabilities ?
6. Network administrator want to replace a hub on LAN with switch, what two results would occurs ?

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Answers :
Please read archive with tag/label Describe how a network works for detail explanations.

1. The biggest benefit of using switches instead of hubs in your internetwork is that each switch port is actually its own collision domain (we can say switch increase the number of collision domains). Hub creates only one large collision domain
2. Please find the drawbacks of Hub and advantages of Switch
3. Basicly, function of the router are to interconnecting networks by selecting best path (routing/path selection) for a packet to travel, and forward packet (packet switching) to outgoing interface using best path in routing table. As an additional feature, routers are capable of providing filtering on a network address and application port level (Access Controll List).
4. Layer 1 devices : hub and repeater.
   
   
   
   Hub actually performs OSI layer 1 functions, repeating an electrical signal. Repeater does not interpret what the bits mean, but does examine and generate electrical signals, a repeater is considered to operate at Layer 1.
   Layer 2 devices : bridge and switch.
   Both bridges and switches operate at the second layer of the OSI model, rocessing and forwarding frames from the data-link layer. Bridges are software based and switches are hardware based. Switches have more ports than bridges. Both ridges and switches forward frames based on MAC addresses.
5. Switch
6. 
   
   The number of broadcast domains would remain the same, the number of collision domain would increase