In Networking, a layer-2 network segments to make distinct domains which are mutually isolated for passing of packets through one or more routers. Such domain is called as Virtual LAN. VLAN has the same attributes as like Local Area Network(LAN). VALN are usually achieved over switches or routers. In this section, we have listed some of the important questions on Virtual LAN with answers. Most of the questions has been collected from different interview. If you are interested you can find more Networking Notes from our ENGINEERING NOTE SECTION to enhance your knowledge.
Important Questions and Answers
1. Difference between VLAN and INTER-VLAN?
Answer: VLAN is a logical group of network users and resources which are connected to administratively defined ports on a switch. The break up broad cast domains of VLAN in layer 2 switch network. Virtual LANs divide a single physical network into multiple broadcast domains.
Whereas VLAN-enabled switches cannot by themselves, forward traffic across VLAN boundaries. So we need to route between these VLANs which is named as inter-VLAN routing.We can achieve this by using either a Layer 3 switch or by a router.
2. What is router protocol and routing protocol?
Answer: A routing protocol is usually used by router for finding dynamically all the networks in the inter-network and to make sure that all routers have the same routing table. Usually routing protocol determines the path of a packet by an inter-network. A routed protocol is used to send user data through the enterprise which is established, when routers come to know about all networks. Routed protocols are assigned to an interface and decides the packet delivery method.
3. What is OSI and its main purpose?
Answer: OSI reference model includes of seven layers helps the data to moved in more optimal from source to the reaching point. And here the hide of protocols are better so the further enhancement are done easily. This reference model are used for both connection oriented and connection-less service.
4. Difference between TPC and UDP?
Answer: The difference between TCP and UDP is connection and connection-less protocol. Due to In TCP for transferring every Packets it needs a acknowledgment packet from receiver ,so if any packet loss happens receiver will not send a acknowledgment for that packet so Transmitter will once again send the packet.so TCP is trusted connection unless UDP will send a packet and will not expect any acknowledgment from the receiver so it is not reliable.
5. Explain the work of SWITCH in detail.
Answer: Switch is a data link layer device that connect multiple LAN segments to form one network segment. In switch when we make transition of the data first it examine the data packets for source and destination then the switch forward the data packet to the appropriate destination.
6. What are the Advantages of LAN.
Answer: Workstations can share peripheral devices such as printers. For every workstations it is cheaper than buying a printer. Workstations do not need their own hard disk or CD-ROM drives which make them cheaper to buy than PCs. User saves their work centrally on the network’s file server. It means that they can retrieve their work from any workstation on the network.
They don’t need to go back to the same workstation all the time. Users can communicate with each other and transfer data between workstations very easily. A single copy of each application package such as a word processor spreadsheet etc. can be loaded onto the file and shared by all users. When a new version comes out it usually has to be loaded onto the server.
7. What is tagging rule?
Answer: On a LAN segment for a given VLAN, every frames should be either implicitly or explicitly tagged.
- Different VLANs on the similar segment uses different options.
- Access Link: Includes VLAN unaware devices. All frames on access links are untagged
- Hybrid Link: Includes both VLAN-aware and VLAN-unaware devices
- Every frames for some VLANs are tagged
- Every frames for other VLANs are untagged
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