Ask Question, Ask an Expert


Ask Computer Network & Security Expert

Answer the following problems.

problem 1) Assume a hacker obtains control of all the BGP-speaking routers in several different Autonomous Systems (ASes). Our hacker has each AS \hijack" several IP blocks. That is, each AS under his or her control announces via BGP that it owns IP blocks for which it does not. Such as, our hacker has AS (CMU) announce a one-hop path to the IP block (MIT).

(a) Suppose that the AS graph still converges to a stable state, can this attack cause routing loops to form? Describe why or why not.

(b) Assume the ASes under attack are identified. Can other ASes change their routing policies to ensure that their traffic still reaches the hijacked IP blocks? Describe.

(c) In response to this attack, assume all ASes agree to check central registry for IP block ownership before a path is considered valid. That is, whenever an AS receives a route to a prefix P, it checks that the last AS in the route actually owns P. Like, upon receiving a path to (MIT), an AS will check that last AS in the route is 3 (MIT). Can a hacker still hijack IP address blocks belonging to ASes he or she does not control? (i.e., can he or she cause traffic destined to those IP blocks to be routed to the ASes he controls?) Describe.

(d) Assume a solution was devised where IANA hosted a server on the Internet which was able to validate all AS paths. Suppose that this server is always trustworthy and paths are valid if and only if the server says so.
State true or false: With this solution an AS can always check the validity of a BGP path advertisement it receives.

problem 2) Why do we require to infer ISP relationships? Why is this information not publicly available?

problem 3) Why would ISPs select to have peering relationships if it means they transport packets for free?

problem 4) Why do ISPs attempt to make sure valley-free routes?

problem 5) Despite the fact that ISPs have set relationships (i.e. provider/customer, peering, etc) based on contractual agreements, execution and management of these policies is not simple. A single misconfigured router within an AS (ie. one with incorrect import and/or export rules) can break these policies. What is a possible solution for this?

Computer Network & Security, Computer Science

  • Category:- Computer Network & Security
  • Reference No.:- M96682

Have any Question? 

Related Questions in Computer Network & Security

Cryptool lab-first download and install cryptool from the

Cryptool lab- First, download and install Cryptool from the website at - If using a windows PC, installed crytool1 - If using a MAC PC, install jcryptool Part1.1 a. Identify the digital signature sche ...

Network management paperin this paper you will research and

Network Management Paper In this paper, you will research and report on network management tools associated with (1) policy compliance, (2) bandwidth management, and (3) asset management. Compare and contrast, at least, ...

Assignmentintroductionin this assignment you will use

Assignment Introduction In this assignment you will use several network tools to look at the protocols and data exchanged between network components. We will be only scratching the surface of the usefulness of these tool ...

Learning team apply encryption standardsyour team was

Learning Team: Apply Encryption Standards Your team was invited to present to a high school IT class to explain how cryptography works. In order to explain the basics, you decide to show the class a tool called, CrypTool ...

Network simulation projectsimulation projectobjectivesbull

Network Simulation Project Simulation Project Objectives • Design and analyze the performance of a network under different traffic conditions. • Design and analyze the performance of a wide area network. • Investigates t ...

Computer scienceunauthorized access to networks and the

Computer Science Unauthorized access to networks and the information they contain can present significant problems to an organization. Part of a good network improvement includes a review of system security and identific ...

What is the typical relationship between the untrusted

What is the typical relationship between the untrusted network, the firewall, and the trusted network? How is an application-layer firewall different from a packet filtering firewall? Why is an application-layer firewall ...

Short paperwan technologies paper research point-to-point

Short Paper WAN Technologies Paper: Research Point-to-Point (dedicated), Packet Switched, and Circuit Switched WAN protocols/circuits/types. Define each protocol and describe at least two data transmission technologies a ...

Project assignment software defined networks1introductionin

Project Assignment: Software Defined Networks 1 Introduction In this assignment you will learn how to use the OpenFlow protocol to program an SDN controller in a Mininet emulated network using POX. The following sections ...

Question 1which of the following must you do before ip

Question 1 Which of the following must you do before IP source guard can be used on a switch port? (Select 2 choices.) A) Enable IP routing on the switch port. B) Enable DHCP snooping on the switch. C) Configure static I ...

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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