BITS 2513 Assignment 1

QUESTION

1.       How many visitors who have visited my website?

        Due to the number of visitor keep increasing time by time, the number of visitor on 10.35pm ( 28/9/2015) is 415.

2.       With reference to Chapter 2, answer the following questions

i.         Briefly describe the function of the equipment at layers 1, 2 and 3.

        Layer 1 (Physical Layer): consists of network equipment such as usb, bluetooth and 802.11 wifi connection. Data are transmitted and received in the form of bits through communication medium such as copper cable.

        Layer 2 (Data Link Layer): concerned with delivery of frames between two devices in a network, it also can detect and recover collisions where a medium is used simultaneously by a device and prevent it from happening again.

       Layer 3(Network Layer): responsible for packet forwarding by routing it to its destination through the routers with using IP address.

ii.       Specify 7 criteria to consider when selecting a NOS.

       a. Performance : serves client seamlessly

       b. Reliability : stable performance in any condition

       c. Adaptability : adapt to all different platform

       d. Affordability : the cost are affordable

       e. Security : ability to eliminate and repel threads

       f. Scalability : can continue to function with expansion of its size

       g. Ease : ease of use and installation

iii.      Explain the differences between Logical address and Physical address.

        

       Logical address is a address which generated by a CPU while physical address is a address which seen by a memory unit and it allows the data bus to access the particular memory cell in main memory. Logical address space is the set of logical addresses generated by a program and logical addresses need to be mapped to physical address using a hardware device called Memory Management Unit (MMU) before they are used. Physical and logical address are same when using compile time and load time address binding but they differ when using execution time address binding. Furthermore, the physical address is a unique MAC address which contains 48 bit while logical address is contain 32 bit. 

iv.     Explain the differences between OS and NOS.

       OS also known as Server Operating System while NOS known as Network Operating System. A server operating system is a software that especially developed to serve as a platform for running multi-user computer programs or application such as Window Server Versions or Linux server. However, network operating system is a software which implements a operating system which oriented to computer networking. The network operating system is typically designed to allow shared file among multiple computer in a network such as LAN (Local Area Network). Network operating system can embedded a router or a firewall which operates in OSI layer 3 (Network Layer). Example of NOS is CISCO IOS or RouterOS.

3.       In your opinion why IPv6 is still not fully implemented.

         IPv6 is designed to solve many of the problems of IPv4, including mobility, auto-configuration, and overall extensibility. IPv6 expands the address space on the Internet and supports a nearly unlimited number of devices that can be directly connected to the Internet.But IPv6 is still not fully implemented because nowsadays not much device can support IPv6. For example, IPv6 only can implemented in device which using Window 7 or above while who still using the older version device could not be implemented.