Answer:
The answer is "2".
Explanation:
In the given question some information is missing, that is "The propagation time for satellite to earth" which is "270 milliseconds" so, the description to this question can be defined as follows:
Given values:
Bandwidth = 64 kbps
Data frames = 512 bytes
Propagation Time (tp ) =270 ms
Change Bandwidth kbps to bps:
1 kb= 1024 bytes
calculated bandwidth= 64 kbps = 64×1024 bps = 65536 bps
1 bytes = 8 bits
512 bytes = 512 × 8 = 4096 bits
Frame length = 4096 bits
Formula
Transmission time (Tt) = Frame length /Bandwidth
Window size = 1+2a
where a = Propagation time/Transmission time
Calculate Transmission time:
Transmission time (Tt) = 4096 / 65536
Transmission time (Tt)= 625 m.sec
Calculate Window size:
Window size = 1+2(270/625)
Window size
= 1+2(0.432)
Window size
= 1+0.864
Window size = 1.864
Window size
= 2
It is a class C address. Class C covers all addresses in the range 192.0.0.0 to 223.0.0.0. The /24 represents the number of network bits in the address so we can work out that the subnet mask of this address would be 255.255.255.0.
Answer:
Network security
Explanation:
Network security is a category of cybersecurity that is related to the protection of the infrastructure of the computer network from unauthorized access and intrusion that may be from intended attack or from an expedient program which may result in the modification, malfunctioning, misuse or unacceptable disclosure of the network and the contents of the network
The category of cybersecurity that 'prevents intruders from accessing, misusing, destroying, adapting, or improperly disclosing networks, network infrastructure, or the information contained within networks' is network security.
Usually that means a physical connection - so either a loose or faulty ethernet cord.
Answer: A) systems analysis phase of the SDLC.
Explanation:
In accordance with system development life cycle(SDLC) , analysis phase is the stage where all the requirement and materials for the system are collected and ordered.The requirements are in the form of input and output which are extracted and documented to provide clear vision of outcome.
- Other options are incorrect because design phase is for designing the format ans structure of system through input components. Planning and selection stage is making scheme through opting correct requirement for system.
- Implementation and operation phase is the stage of implementing the components on system structure to make them perform their respective tasks. Logic modelling level is defining inputs , components, outputs in logical manner so that they provide desired result operating.
- Thus, the correct operation is option(A).
