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542 questions
Briefly differentiate between CDMA and GSM technologies.
1)Code Division Multiple Access 2) storage type is internal memory
Briefly describe the congestion control, slow start and fast retransmit mechanism.
Congestion occurs when the load network i.e, the number of packets sent to the network is greater than the capacity of the network. Congestion control refers to the mechanisms and techniques to control the congestion and control the load below the capacity. The congestion control mechanism are divided into two categories:
What are the functions of home agent and foreign agent in mobile IP? How does I-TCP differ from traditional TCP? Describe with shome agent & foreign agent and I-TCP vs. traditional TCPuitable diagram.
Home agent is a type of mobility agent. In Mobile Internet Protocol (Mobile IP), a home agent is a router on a mobile node's home network that maintains information about the device's current location, as identified in its care-of address.
What do you mean by mobile communication? What are the advantages of mobile communication over PSTN? What is the difference between network protocol and network architecture?
A wireless mode of communication in which the voice and the data information are send, transmitted and received via microwaves. This type of communication allows the users to communicate with each other while moving from one place to another.
What are the differences between destination sequence distance vector and the standard distance vector routing algorithms? What are the frequency bands of operation for CDMA?
Difference between destination sequence vector and standard distance vector routing:
Why does CSMA/CD not work for medium access control of WLAN? What is the alternative mechanism of CSMA/CD? Write steps of operation to implement such an alternative mechanism.
The basic idea behind CSMA/CD is that a station needs to be able to receive while transmitting to detect collision. When there is a collision the station receives two signal: its own signal and the signal transmitted by a second station.
What is meant by access control? What are the contention-based and contention free access control mechanisms?
When two or more stations are connected with each other using the same link(multipoint or broadcast link), there is a need of multiple access protocol to coordinate access to the link, which decides when and which station should be access the link.
Write short notes on
A vertex cover of an undirected graph is a subset of its vertices such that for every edge (u, v) of the graph, either ‘u’ or ‘v’ is in vertex cover. Although the name is Vertex Cover, the set covers all edges of the given graph.
Define classes P,NP,NP hard and NP-complete and also explain their relationship diagrammatically. What is nondeterministic algorithm? Explain with example. Define circuit satisfiability problem and prove that circuit SAT is in NP class.
P- P is the set of decision (or optimization) problems that can be solved by a deterministic algorithm in polynomial time, i.e. O(nk) time where n is the input size and K is non negative value independent of n.
State the Max-flow min cut theorem for network flow analysis. Trace the execution of Ford-Fulkerson algorithm for finding the maximum flow in the graph.
Max-flow min cut theorem for network flow analysis: If f is a flow in a flow network G(V,E) with source s and sink t, then the following conditions are equivalent:
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