Computer Networks Answers

CAT-6 twisted pair cable is a commonly used computer networks cable that provides a frequency bandwidth of up to 250 MHz. It is suitable for most varieties of Ethernet over twisted pair up to 1000 BASE-T (Gigabit Ethernet). Determine whether a signal-to-noise ratio (SNR) of 20 dB is adequate to transmit 0.9 Gbps on this cable?

2 Provide a list of devices, network components and software need to design a network for above scenario and justify your selection. 

Convert the following

1. 1010101110 (Convert to Decimal, Hexadecimal, and Octal)

2. 719 (Convert to Hexadecimal, Octal, and Binary)

3. 634 (Convert to Hexadecimal, Binary, and Decimal)

4. 61E (Convert to Binary, Decimal, and Octal)

 You have been allocated a class B network address of 135.1.0.0 and need to create 4 subnets each with around 200 hosts what is the easiest mask to use to satisfy the criteria?

What is the output of the first round of the DES algorithm when the plaintext and the key are both all ones

State the advantages and disadvantages of Link-state Routing, a typical example is Dijkstra's algorithm

A company network composed of two LANs (Local Area Networks) respectively named LAN1 and LAN2. Each LAN is connected to an edge router (R1 and R2) and each edge router is connected to a central router (RC) via point-to-point links (PPL1 and PPL2). The central router is also connected to the Internet via the point-to-point link (PPLX)

1. Knowing the largest number of computer that connect a LAN is 60 (without the router). Which appropriate prefix length will you use ? Which smallest address bloc could your ISP provide you if it just receive the bloc 211.2.0.0/16 (assume all the address space of this bloc is available for the ISP customers and the first appropriate sub-bloc is for you)? 
2. Which address plan could you propose (sub-net address allocation)?

There is a PC with 2 MBR hard drives. 1st drive has 3 partitions, 2nd - 5. Every partition has a Windows OS installed. Which OS will be booted by default when you turn the PC on?

Ping to a destination machine does not work. What could be the reasons?

An Internet user have put in a set top box offered by his ISP (Internet Service Provider). This box is connected to the ISP via ADSL througth the telephone line and can provide Internet access service.

1. Through this Internet access, which kind of application could be used? Does the characteristics of the line meet the requirements of those applications? Justfy your answer.

2. What is the average download rate of the full web page in persistant non pipelined mode (Ignore time processing at the application layer)?