GAN SIONG HIN
3BITC
B031310140
Question and Answer:
1. How many visitors who have visited my website?
2. With reference to Chapter 2, answer the following questions
i. Briefly describe the function of the equipment at layer 1, 2 and 3.
The equipment of Layer 1 is USB, Bluetooth and 802.11. This layer called Physical layer. It also transmits and receives raw data to communication medium. It does not care about the contents. In this layer, it deal with representing bits.The equipment of Layer 2 is Ethernet MAC and PPP. This layer called Data Link layer. It detects and corrects the errors to transfer the data frames from one node to another over the physical layer. It also accepts acknowledgements from immediate receiver. In this layer, it deal with frames.
The equipment of Layer 3 is IP and X.25. This layer called Network layer. It controls the operations of the sub-net, deciding which physical path the data takes. It also relay and route information to destination. In this layer, it deal with data-grams.
ii. Specify 7 criteria to consider when selecting a NOS.
The 7 criteria to consider when selecting a NOS (Network Operating Systems) is:a) Reliability
Reliability can stably perform in any condition.
b) Performance
Serve the clients in a seamless way.
c) Adaptability
Adapt request of different platform.
d) Affordability
Ability to pay the cost.
e) Security
Ability to eliminate and repel threats
f) Scalability
Continue to function well when size expand.
g) Ease
Ease of use and ease of installation.
iii. Explain the differences between Logical address and Physical address.
The differences between Logical address and Physical address is:The logical address is a 32-bit IP address assigned to NICs for routing purpose, meanwhile physical address is 48-bit MAC address encoded in NICs by manufacturers.
The logical address generated by the CPU when executing a program, meanwhile physical address seen by the memory unit .
iv. Explain the differences between OS and NOS.
The differences between OS (Operating Systems) and NOS (Network Operating Systems) is:
OS is a system installed in a computer mainly to manage applications, hardware and connection to networks, meanwhile NOS is the system installed on a server with the basic function of OS but can used to managed network resources.