Basic CS-Networks [3i Infotech Placement]: Sample Questions 45 - 47 of 90
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Question 45
Question MCQ▾
In OSI, terminal emulation is done in
Choices
Choice (4) | |
---|---|
a. | application layer |
b. | sessions layer |
c. | transport layer |
d. | presentation layer |
Answer
a.Explanation
- Terminal emulation makes one computer terminal appear like other terminal.
- Gives users ability to log on and get access to legacy programs in a mainframe operating system as a separate program task.
- Terminal emulation comes in the application layer that uses software installed on PC or LAN server.
- The PC thus functions as a dump terminal attached to a particular mainframe.
- Telnet is also called terminal emulation.
Question 46
Explanation
- An obsolete protocol for routing datagrams between internet gateways.
- Designed as internet protocol datagram service to the transmission control protocol.
- Defined as internet layer protocol.
- A minimum hop algorithm measuring distance in router hops- implementing distributed shortest-path methodology.
- Message has a field header that identifies the message type and the format of the remaining field.
Question 47
Explanation
- BGP manages routing of packets across the internet through the exchange of routing and reachability information between routers.
- It directs packets between autonomous system networks managed by a signal enterprise or service provider.
- Described as a reachability protocol rather than a routing protocol.
- It is a Path Vector Protocol maintaining paths to different hosts, networks and gateway routers- determining routing decision based on that.
Role of BGP:
- It is Path Vector Protocol- communicating entire autonomous system path topology to other networks.
- Maintains routing table with topologies of all externally connected networks.
- Allows classless interdomain routing allocating IP addresses to connected internet devices.
- Created to extend Exterior Gateway Protocol.