Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Computer Network & Security Expert

problem 1) In XIA, a host identifier is the hash of a host's public key.

(a) prepare down one advantage of this scheme.

(b) prepare down disadvantage of this scheme.

problem 2) One proposed XIA principal type is content. Routers can cache chunks of content and respond directly when they see a request for a chunk in their cache. Though, caching is already widespread today. Such as, many organizations (like CMU) employ transparent HTTP proxies at the edges of their networks. These proxies cache web content requested by hosts inside network and can respond with that content if it is requested by another host in the network. Why is content caching in XIA better than today's content caching?

problem 3) For a network with single sender and a single receiver, the 802.11 MAC protocol works as follows:

1) The sender senses channel and makes sure that it has been clear for at least one DIFS (Distributed InterFrame Space) before sending a frame.

2) Before transmitting a frame, sender transmits the preamble to alert the receiver there is data coming and permit it to synchronize with the sender. The preamble is sent at the lowest data rate.

3) After receiving a frame, receiver waits one SIFS (Short InterFrame Space) and sends a link-layer ACK.

For 802.11g, the parameters are as follows:

Parameter                                    Value
Time to transmit preamble             192  s
SIFS                                            10 s
DIFS                                            28 s
Maximum transmission rate            54 Mbps

Link layer ACK frame size 14 bytes

(a) Matt is sending data directly to David's laptop using a TCP connection over 802.11g in ad hoc mode. Suppose the following:

i) Propagation latency is 0.

ii) All frames are received correctly.

iii) David and Matt are achieving the maximum underlying transmission rate (54 Mbps)

iv) TCP is not using delayed ACKs; TCP on David's laptop sends an ACK for each data packet received from Matt.

v) A TCP data packet contains 1500 bytes of payload plus 30 bytes of header

vi) A TCP ACK packet is 70 bytes total.

vii) What goodput will Matt and David achieve? That is, at what rate will they transmit useful application data?

(b) What is the reason of using differently-sized interframe spaces? That is why do we need DIFS and SIFS - why not just pick a single IFS?

problem 4) In schemes like Portland, hierarchical addresses like IP are discarded in favour of at addresses like MACs. However, these at addressing schemes completely destroy the scalability of routing. How do schemes like Portland get around this?

problem 5) Would a scheme like Portland be applicable outside the data center?

Computer Network & Security, Computer Science

  • Category:- Computer Network & Security
  • Reference No.:- M96721

Have any Question? 


Related Questions in Computer Network & Security

Assignment designing compliance within the lan-to-wan

Assignment: Designing Compliance within the LAN-to-WAN Domain Note: Review the page requirements and formatting instructions for this assignment closely. Graphically depicted solutions, as well as the standardized format ...

Develop a wlan plan for acme graphic design based on a

Develop a WLAN plan for Acme Graphic Design based on a chosen Blueprint and security to the owner. Write a 700- to 1,750-word document using Microsoft® Word finalizing describing your final network design incorporating y ...

What are the main components of cryptology explain the

What are the main components of cryptology? Explain the relationship between plaintext and ciphertext ? Define asymmetric encryption. Why would it be of interest to information security professionals? One tenet of crypto ...

Network securitythe focus of the reseach paper is host

Network Security The focus of the reseach paper is Host Intrusion Detection Systems (HIDS) or AntiVirus Systems. Computer Virus creates major headaches for most organizations, as this list of 10 worst PC virus outbreaks ...

Write one paragraph only for each questions1- can a

Write one paragraph only for each questions. 1- Can a business survive in today's world without a website or a poorly maintained website? Why or Why not? 2- What's your biggest fear about using the Internet? Why? Can you ...

In order to provide for the new services at the akron ohio

In order to provide for the new services at the Akron, Ohio facility, the site must be added to the existing domain and configured. Create a security matrix spreadsheet and security strategy summary. Include the user rol ...

Short answer1 classify each of the following

Short Answer 1. Classify each of the following occurrences as an incident or disaster. If an occurrence is a disaster, determine whether business continuity plans would be called intoplay. a. A hacker breaks into the com ...

There are many arguments about cloud based information

There are many arguments about cloud based information services and/or offering IT as a cloud-based service. Some say cloud computing is nothing more than outsourcing IT and creating a dependency that will trap the organ ...

Assignment give an answer to the following topicswhat are

Assignment: Give an answer to the following topics: What are the security issues with wireless LANs and WANs in a data processing environment? What are the recommended solutions to the issues identified? What are the sec ...

The us government has put in place ipv6-compliance mandates

The U.S. government has put in place IPv6-compliance mandates to help with the IPv4-to-IPv6 transition. Such mandates require government agencies to have their websites, email and other services available over IPv6. Let' ...

  • 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