Networking Job Interview Questions and Answers – Page 5

Networking Job Interview Questions and Answers – Page 5
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27. What is User Agent?

Answer: User agent is a software that provides the service to the user to make the process of sending and receiving a message easier. The following are User Agent services.


28. What are the different types of layers of OSI model? – CCNA

Answer:  There are 7 different types of OSI Model and they are:

a. Physical Layer: Media, Signal and Binary Transmission. Examples include hubs, repeaters, and Ethernet cables. Data is transmitted by an electric voltage, radio frequencies, infrared or ordinary light. examples include Ethernet, FDDI, B8ZS, V.35, V.24, RJ45.

b. Data Link Layer: At OSI Model, Layer 2, data packets are encoded and decoded into bits. The data link layer is divided into two sub layers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. The MAC sub layer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control, and error checking. examples include PPP, FDDI, ATM, IEEE 802.5/ 802.2, IEEE 802.3/802.2, HDLC, Frame Relay.

c. Network Layer: This layer handles the addressing and routing of the data (sending it in the right direction to the right destination on outgoing transmissions and receiving incoming transmissions at the packet level). IP is the network layer for the Internet. examples include AppleTalk DDP, IP, IPX.

d. Transport Layer: The Transport Layer delivers data across network connections. TCP is the most common example of a Transport Layer 4 network protocol. Different transport protocols may support a range of optional capabilities including error recovery, flow control, and support for retransmission. examples include SPX, TCP, UDP.

e. Session Layer: The Session Layer manages the sequence and flow of events that initiate and tear down network connections. At Layer 5, it is built to support multiple types of connections that can be created dynamically and run over individual networks. examples include NFS, NetBIOS names, RPC, SQL.

f. Presentation Layer: This layer provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa. examples include encryption, ASCII, EBCDIC, TIFF, GIF, PICT, JPEG, MPEG, MIDI.

g. Application Layer: The Application layer supplies network services to end-user applications. Network services are typical protocols that work with user’s data. For example, in a Web browser application, the Application layer protocol HTTP packages the data needed to send and receive Web page content. This Layer 7 provides data to (and obtains data from) the Presentation layer.  examples include WWW browsers, NFS, SNMP, Telnet, HTTP, FTP

  Reference: webopedia


29. Which layers are network support layers?

Answer: There are 3 different types of Onetwork support layers and they are:

a. Physical Layer: Media, Signal and Binary Transmission. Examples include hubs, repeaters, and Ethernet cables. Data is transmitted by an electric voltage, radio frequencies, infrared or ordinary light. examples include Ethernet, FDDI, B8ZS, V.35, V.24, RJ45.

b. Data Link Layer: At OSI Model, Layer 2, data packets are encoded and decoded into bits. The data link layer is divided into two sub layers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. The MAC sub layer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control, and error checking. examples include PPP, FDDI, ATM, IEEE 802.5/ 802.2, IEEE 802.3/802.2, HDLC, Frame Relay.

c. Network Layer: This layer handles the addressing and routing of the data (sending it in the right direction to the right destination on outgoing transmissions and receiving incoming transmissions at the packet level). IP is the network layer for the Internet. examples include AppleTalk DDP, IP, IPX.

 

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