Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Computer Network & Security Expert

problem 1) Instead of traceroute, you can also use ping to determine the route that packets take to a given network host.

It does so by using IP Record Route option. Try the following two commands:

ping -R www.cmu.edu

traceroute www.cmu.edu

prepare down the difference in their output? Now try the following:

ping -R www.google.com

Do you get the desired output? Describe your observation. Finally, try running the following command a few times.

traceroute www.whitehouse.gov

What do you notice about the results you get from different runs?

problem 2) Harry Bovik is working on web site which has multiple replicated servers located throughout the Internet. He plans on using DNS to help direct clients to their nearest server replica. He comes up with the hierarchical scheme. Harry has divided his server replicas into three groups (east, west and central) based on their physical location. A typical query occurs as follows:

When the client makes a query for www.distributed.hb.com, the root and.com name servers are contacted first. It returns name server (NS) record for ns1.hb.com. The TTL of this record is set to 1 day. The ns1.hb.com name server is then queried for the address. It examines source of the name query and returns a NS record for one of {east-ns, central-ns, west-ns} .distributed.com. The choice of which name server is based on where ns1 thinks the query came from. At last, one of {east-ns, central-ns, west-ns}.distributed.com. is contacted and it returns the address (A) record for the most lightly loaded server in its region.

Answer the following problems based on this design.

a) Harry's name server software has only two options for TTL settings for A and NS records - 1 day and 1 minute. Harry selects the following TTLs for each record below:

1. NS record for {east-ns, central-ns, west-ns} distributed.com - 1 day TTL.

2. A record for {east-ns, central-ns, west-ns} .distributed.com- 1 day TTL.

3. A record returned for the actual Web server - 1 minute TTL.

Briefly describe why Harry's choices are reasonable, or why you would have made different choices.

b) In general, name resolution systems map names based on the name and context. In this particular case, what are two items of context that the name resolution uses?

c) Harry's Web site is especially popular among CMU students. The CMU network administrator estimates that there is one access from CMU every 3 minutes. Each access results in the application resolving the name www.distributed.hb.com

Suppose the following:

No other DNS queries are made in CMU

All CMU clients use the same local name server. This local name server is mapped to the east-ns region. Web browsers do not do any caching on their own.

How many accesses per hour will be made to the following name servers to resolve these CMU queries? Describe your calculation.

1. The Root Servers

2. ns1.hb.com

3. east-ns.distributed.com

Computer Network & Security, Computer Science

  • Category:- Computer Network & Security
  • Reference No.:- M96770

Have any Question? 


Related Questions in Computer Network & Security

Cloud networking and service provisioning - standard

Cloud Networking and Service Provisioning - Standard project: Auction System in the Cloud 1. Introduction The project consists of designing and implementing an auction system (AS) which offers its services as SaaS to end ...

I have one question and need a response to the other

I have one question and need a response to the other part.  The question needs to be at least two paragraphs with in text references and the other response need to be at least one paragraph and no references. Part 1 - Q1 ...

Assignment services in your arearesearch dsl and cable

Assignment: Services in Your Area Research DSL and cable modem services available closest to your community. You may use neighboring communities or regions if your community does not have access to DSL or cable modem ser ...

Assignmentyou have been tasked with reconfiguring the

Assignment You have been tasked with reconfiguring the network for your company, which has grown considerably over the past year. You have used only static routing in the past, but you do not wish to spend the administra ...

Assignmentthe vice president of sales for your company has

Assignment The Vice President of Sales for your company has asked you for more information on cloud-based office productivity suites. He tells you that the Sales team is often remote and needs to be able to stay connecte ...

Data information decision please respond to the

"Data Information Decision" Please respond to the following: · With the obvious pace of current technology development, data continues to grow daily. Imagine that you are a Database Administrator for a large organization ...

Pros amp cons of very simple vs very planned networkwrite a

Pros & Cons of Very Simple Vs Very Planned Network Write a 3-5 page report that discusses the pros and cons of very simple plans versus detailed plans, although the standards mandate very specific requirements for the pl ...

Benefits of cloud-based office productivity softwarebased

Benefits of Cloud-based Office Productivity Software Based on what you have learned about using cloud-based office productivity software, create a 5-slide presentation to the department head or CEO to convince him or her ...

Dqfacebook email electronic commerce and collaborative

DQ Facebook, email, electronic commerce, and collaborative sites for both work and leisure are a normal part of our everyday computing activities. Personal information entered on these websites become partially owned by ...

Taskprovide short answers to the following six questions

Task Provide short answers to the following six questions. Your answers should be clear, concise and to the point. Prepare a single document (MS Word or PDF, NOT both) along with title page and submit it online using EAS ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen