Computer Network Questions and Answers August 13, 2022

Suppose Prove that Z(x(k)KEN) X(z). k zx))xc). x(n) KEN n0 X(z).

Discuss the mode for propagating light along optical channels.

What are the disadvantages of optical fiber as a transmission medium?

List out the steps followed is checksum checker side.

What is protocol data unit?

What are distance vectors in nodes E, D, and C? Explain how the least cost path from E to A was determined by E based on these three distance vectors.

Consider the network shown in the figure below A 4 B D 10 4 4 E 2 F

demonstrate your understanding of the following and how it applies to cybersecurity and explain in detail: Confidentiality. Integrity. Availability.

Research in the library or on the Internet about the history of Windows Server. Write a APA formatted descriptive paper on the history of Windows Server. Select an earlier version. This can include Windows 2000, 2003 Server, or 2008 Server. Compare the evolution of Windows Server, including Windows 2016 R2 Server. Cite your sources. These are the

Physical topology refers to the way in which a network is laid out physically. i. Assume that you have been asked to design a network for an organization. What kind of factors that you would consider when designing a network and deciding which type of network topology to use Discuss with appropriate examples any TWO (2) of them. You have been

Why Ethics is important for Penetration Testing in the cyber domain? Select two examples from research on the Internet (instances where ethics has proved to be an issue) and paper around those examples. Please cite your references. The two (or more) references should provide evidence for reasons why pen testers need to scrupulously obey the law

There exist companies that sell their knowledge of bug bounties to mainly government organizations that need specific and tailored cybersecurity capabilities and protective solutions. +To what extent do you think governments are gathering information on zero-day exploits and then using them or holding them in reserve for the future? +Should this

Suppose a link has a propagation delay of 20 sec and a bandwidth of 2 bytesusec. (a). How long would it take to transmit a 600byte packet over such a link (b). How long would it take to transmit the 600byte packet over two such links, with a storeandforward switch in between Suppose the path from A to B has a single switch S in between ASB. Each

Hackers strategize their attacks by following a set of phases or stages that constitute the cyberattack life cycle (i.e., cyber kill chain). In order to protect an organization's network and assets from attack, prevention must occur at each phase of the attack life cycle. Describe steps that should be taken at each of the eight stages of the

Assuming there are business branches. What will be the best WAN technology for them to share and exchange data, and what will be the offered bandwidth based on that technology?

Draw a diagram of your home computing network, including any routers, modems, computers, tablets, mobile phones and other devices connected to the network (TV, gaming, etc.). Explain 'why' you chose this design and any plan for upcoming changes to your network.

A total of 25 MHz of bandwidth is allocated to a particular FDD cellular telephone system that uses two 25 kHz simplex channels to provide full duplex voice and control channels. Assume each cell phone user generates 0.1 Erlangs of traffic. Assume Erlang B is used. a) Find the number of channels in each cell for a sevencell reuse system. b) If

A cellular system using a cluster size of 7 cells, each with 3 km area. It is operated with 660 channels, 30 of which are designated as setup channels so that there are about 90 voice channels available per cell. If there is a potential user density of 9000 usersKm in the system, and each user makes an average of one call per hour and each call

1. Configure PCs with IP address, subnet mask and default gateway. 2. Basic router and switch configurations. (hostname, privileged exec password, console and VTY lines etc.) 3. Create and name Vlans. 4. Assign access ports the proper vlan. 5. Create 802.1q Trunks with native vlan. 6. Create an EtherChannel between two switches. 7. Designate a

1) Describe the steps involved in implementing the proposed security strategy. 2) Arrange the details of the project in a logical deployment order and provide an estimate of durations in the document as a table. 3)Indicate and describe any special skills that might be needed. 4)Provide a rough estimate of equipment, software, and services needed

A train journey consists of a connected sequence of stages formed by edges on thedirected network from Arlie to Bowen. The number of available seats for each stage isindicated beside the corresponding edge, as shown in the diagram. The five cuts, A, B, C, D and E, shown on the network, are attempts to find the maximum number of available seats

cut A Arlie cut B 4 cut C 0 3 1 9 4 7 cut D 8 Bowen 4 cut E

CDMA system spreads the spectrum by allocating a code to each communication. Each user is differentiated from other users with a code. To listen to user N, the receiver needs only multiply the signal received by code N for the user. Suppose there are five people in the CDMA system. Draw the CDMA method using three-axis coordinates (time,

Smith, Smith, Smith, and Smith is a regional accounting firm that is putting up a new headquarters building. The building will have a backbone network that connects eight LANs (two on each floor). The company is very concerned with network errors and reliability. 1) what advice you would give regarding the design of the building and network cable

Suppose there are 57 packets entering a queue at the same time. Each packet is of size 7 MiB. The link transmission rate is 4.7 Gbps. What is the queueing delay of packet number 13 (in milliseconds, rounded to one decimal place, e.g. 0.01234 seconds would be entered as 12.3)

You have captured the following data with a protocol analyzer. 05 64 12 C4 03 00 A2 00 40 44 C6 C4 02 32 01 07 01 05 B7 05 A4 E8 00 4B B7 05 64 0A 44 A2 00 03 00 7F BA AD C4 81 00 00 75 64 Answer the following questions about this data. (a) How many data bytes are in the first packet? (b) What is the address of the sender of the first packet? (c)

Explain how you would read single point digital variables 6 and 12 and analog variable 18 from IEC 60870 RTU address 5. Give examples of the basic frame structure only

What is the application of a signal cable List three types of signal cable. Ins SA Buc What Is Straight Through Cable What Is Crossover Cable ((Draw both RJ45 Pinout diagram.),What is the application of a signal cable List three types of signal cable. Ins SA Buc What Is Straight Through Cable What Is Crossover Cable ((Draw both RJ45 Pinout

From where a Windows retail license can be purchased? What needs to be done to keep Windows performing well? What is the term used to refer specifically to Intel processors? What uninterruptible power supply (UPS) do? What does a system image include? What are device drivers? What you should do to verify protection in Windows 8? What

Given the network depicted in the diagram, describe what happens within the network when C1 sends packets to C7, as well as, what happens when C3 sends packets to C5 at the same time C1 is sending its packets. Also, what could you do to reduce the effects of the phenomenon that occurs when two devices on the same network segment send packets at

in Python Create a class called weather that has a list containing weather parameters. Overload the in operator that checks whether an item is present in the list or not

Recreate the floor plan in Visio. . Create a network diagram in Visio that includes the following devices and how they will be connected. Network Drops Switch Placement Router Placement .WAN Devices Wireless Access Points Server location Printer location Workstations Your floor plan should meet all of the criteria listed to receive full credit.,

1. ABC Inc. wants 12 subnets for its Class C address 200.10.10.0 No subnet needs more than 15 host addresses. 2. XYZ Corp. hired you as productivity consultant. Currently, it employs six people who routinely exchange information via sneakernet. The company wants the most inexpensive solution and only minimal training for employees. Employees must

Display the basic topology for your selected organization. Be sure you include routers, switches, and all of the basic network connection hardware. Diagram your IP addresses. Calculate and add your IP ranges and subnets into your diagram.

What high-availability and/or fault-tolerance does Azure have to deal with power outages or natural disasters in your region? When addressing this, be sure to describe availability zones. Will your network benefit from them? Why or why not?

Suppose we want to send a file that is 2 x 106 bits (2 Mega bits) long over a network of four routers as shown in Figure (a). Each link has a data rate of 1 Mbps. Assume the propagation and processing delays are zero or negligible, and the header sizes are also negligible. The packet switches operate in storeandforward mode i.e. each switch must

Consider a new cipher block chaining (NCBC) scheme where mn1 cn mn is encrypted to yield Cn1 (recall that in the regular CBC, mn1 cn is encrypted to yield Cn1). (a) With regular CBC, if one ciphertext block is lost, how many plaintext blocks are lost (b) With NCBC, why do things get back in sync if cn and C1 are switched (c) How about if a

(a) Give two examples where even the use of strong encryption algorithms can result in significant vulnerabilities HINT We have covered a few examples in the class. (b) A onetime pad must never repeat. Yet, in a series of fixedlength numbers, for example 8bit bytes in RC4, some number must ultimately repeat, because there are only 256 8bit numbers

Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a failure typically takes four hours to fix. What is the availability of the replicated service? Q2) In a multi-user game, the players move figures around a common scene. The state of the game is

Figure 21.18 Function Word count Grep Sort N.B. This relies heavily on the intermediate step Inverted index Examples of the use of MapReduce Initial step Partition data into fixedsize chunks for processing Map phase For each occurrence of word in data partition, emit Output a line if it matches a given pattern For each entry in the input data,

1. If we wish to use a logic gate to turn on an LED only when all the inputs are low, which gate would you use 2. Which of the logic gates above would be used to detect if both inputs are the same (both low or both high) 3. Which of the above logic gates would detect if the inputs are different

a) Suppose you went to the Janata Bank to pay your Hall Dues. Which data structure they had followed to serve you. b) Write down the algorithms to insert and delete item from Queue... c) Consider following Queue of characters which is allowed in five memory cells. FRONT2 REAR3 C Describe the Queue while the following operations take place

What is the differences between physical and logical address, and why do we need logical addresses Discuss IPv4 and IPv6 according to it capabilities to address a single device on any network in the world and how it correlates to the Internet of Things (IoT). Activate Wi

For each of the following problems (described informally in English), first define a language LC 0, 1 that formalizes the problem. Then describe the correspondence between (i) in stances of the problem with their answers, and (2) strings and their (non)membership in the language. As an example, consider the problem Given a PNG image, which half

What is unicast communication and what is the real-life example of using unicast communication? Explain in detail.

1. What are the two modes of Bitlocker drive encryption? 2. In what Operating System EFS was first included? 3. What is App Locker used for? 4. What does auditing let you track? 5. At what level account policies must be configured? 6. What Windows 10 security policies can be used to control? 7. What is Windows Defender? 8. How Windows Store apps

Consider a transaction processing system that contains a "front-end" processor, which accepts and translate user queries arriving from a large number of terminals and formats the replies, and a "back-end" processor running a database management system. The database files are stored on disks A and B that are connected to the "back-end" processor.

The high topography in the Himalayas combined with heavy monsoon rain cause massive erosion of the mountains and sediment transport to the Bay of Bengal. Sediment transport measurements in the main rivers of eastern north India indicate that the Ganges carries 262 million tonsyear and the Brahmaputra carries 387 million tonsyear. 1. Assuming that

What are Group Policies? What does GPO stand for? What are the three types of GPOs? Can GPOs be applied on Linux environments? What's the difference between applying GPOs on a local system compared to a domain controller? What tool can you use to modify GPOs?

Design a program to tag all the string as shown below and evaluate the emmision probality and transition probability table. Mary Jane can see Will Spot will see Mary Will Jane spot Mary Mary will pat Spot Also, after the formulation of these table print the emmision probality and transition probability with the probability of this sequence being

1. Discuss the TCP connections needed in FTP. 2. Discuss the basic model of FTP.

What is the function of SMTP?

1. What is the difference between a user agent (UA) and a mail transfer agent (MTA)? 2. How does MIME enhance SMTP?

Why is an application such as POP needed for electronic messaging?

Write down the three types of WWW documents

1. Give the format of HTTP request message. 2. Give the format of HTTP response message.

1. What is the purpose of HTML? 2. Define CGI.

How is a secret key different from public key?

Name four factors needed for a secure network.

What is a digital signature?

What are the advantages & disadvantages of public key encryption?

What are the advantages & disadvantages of secret key encryption?

1. Define permutation. 2. Define substitutional & transpositional encryption.

Explain ISO/OSI reference model.

Explain coaxial cable & fiber optics.

Explain line coding (digital to digital conversion).

1. Explain error control mechanism. 2. Explain the flow control mechanism.

Explain error detection and error correction techniques.

Explain about HDLC.

Explain about Ethernet.

Explain the frame format for token ring and token bus.

Explain the two approaches of packet switching techniques.

Explain IP addressing method.

Define routing & explain distance vector routing and link state routing.

Define bridge and explain the type of bridges.

Explain subnetting.

Write short notes about repeaters, routers and gateways

Explain the duties of transport layer.

Explain socket in detail.

Explain UDP & TCP.

Explain the functions of SMTP.

Explain the WWW in detail.

Your location has been assigned the 172.16.5.0 /24 network. You are tasked with dividing the network into 7 subnets with the maximum number of hosts possible on each subnet. What is the dotted decimal value for the subnet mask? How many additional bits will you need to mask in the subnet mask? What is the CIDR value for the new subnet mask? What

In the table below, fill in the Network ID, First Host, Last Host, and Broadcast address for the first 4 subnets that are created with the new subnet mask. Subnet Network ID First Host 1 2 3 4 Last Host Broadcast

Your location has been assigned the 10.99.255.0 /24 network. You are tasked with dividing the network into 9 subnets with the maximum number of hosts possible on each subnet. What is the dotted decimal value for the subnet mask? How many additional bits will you need to mask in the subnet mask? What is the CIDR value for the new subnet mask? What

In the table below, fill in the Network ID, First Host, Last Host, and Broadcast address for the first 4 subnets that are created with the new subnet mask. Subnet Network ID First Host 1 2 3 4 Last Host Broadcast

Your location has been assigned the 172.16.99.0 /24 network. You are tasked with dividing the network into 7 subnets with the maximum number of hosts possible on each subnet. What is the dotted decimal value for the subnet mask? How many additional bits will you need to mask in the subnet mask? What is the CIDR value for the new subnet mask? What

In the table below, fill in the Network ID, First Host, Last Host, and Broadcast address for the first 4 subnets that are created with the new subnet mask. Subnet Network ID First Host 1 2 3 4 Last Host Broadcast

Your location has been assigned the 10.56.87.0 /24 network. You are tasked with dividing the network into 9 subnets with the maximum number of hosts possible on each subnet. What is the dotted decimal value for the subnet mask? How many additional bits will you need to mask in the subnet mask? What is the CIDR value for the new subnet mask? What

In the table below, fill in the Network ID, First Host, Last Host, and Broadcast address for the first 4 subnets that are created with the new subnet mask. Subnet Network ID First Host 1 2 3 4 Last Host Broadcast

What are headers and trailers and how do they get added and removed?

What is a virtual circuit?

What are the responsibilities of network layer?

What are data grams?

What are the two types of implementation formats in virtual circuits?

1. What is meant by switched virtual circuit? 2. What is meant by Permanent virtual circuit?

1. Define Routers. 2. What is meant by hop count? 3. How can the routing be classified?

1. What is time-to-live or packet lifetime? 2. What is meant by brouter?

1. Write the keys for understanding the distance vector routing. 2. Write the keys for understanding the link state routing

1. How the packet cost referred in distance vector and link state routing? 2. How the routers get the information about neighbor?

1. What are the four internetworking devices? 2. Define IP address

1. What is Token Bus? 2. What is token passing? 3. Define Masking?

1. What are the rules of boundary-level masking? 2. What are the rules of nonboundary-level masking?

1. Define Gateway. 2. What is LSP?

What is function of transport layer?

What are the duties of the transport layer?

What is the difference between network layer delivery and the transport layer delivery?