EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Chapter 2, Problem P21P
Program Plan Intro
DNS:
DNS stands for Domain Name System. It is the way that internet domain names are located and translated into internet protocol address.
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Catalog DNS records by the kind of record they include. Each one is shown with examples, and its use is discussed. Is it conceivable, in your opinion, to have a web server with the same name as an email server?
For DNS query, it is natural to expect that the local DNS server may not know how to resolve an
address. In this case, further queries will be made by this local DNS server. If a hacker can find
"a way" to make a certain DNS server report back the wrong IP address, then anyone trying to
get to one Web address will be sent to a bogus one, without any obvious way for the user to
detect that anything is wrong. Likewise, email could be delivered to the wrong destination.
1) Describe two possible attacks to make the resolver report the wrong IP address.
A person's e-mail address is his or her login name @ the name of a DNS domain with
an MX record. Login names can be first names, last names, initials, and all kinds of
other names. Suppose that a large company decided too much e-mail was getting lost
because people did not know the login name of the recipient. Is there a way for them to
fix this problem without changing DNS? If so, give a proposal and explain how it works.
If not, explain why it is impossible.
Chapter 2 Solutions
EBK COMPUTER NETWORKING
Ch. 2 - List five nonproprietary Internet applications and...Ch. 2 - Prob. R2RQCh. 2 - Prob. R3RQCh. 2 - Prob. R4RQCh. 2 - Prob. R5RQCh. 2 - Prob. R6RQCh. 2 - Prob. R7RQCh. 2 - Prob. R8RQCh. 2 - Prob. R9RQCh. 2 - Prob. R10RQ
Ch. 2 - Why do HTTP, SMTP, and POP3 run on top of TCP...Ch. 2 - Prob. R12RQCh. 2 - Prob. R13RQCh. 2 - Prob. R14RQCh. 2 - Prob. R15RQCh. 2 - Prob. R16RQCh. 2 - Prob. R17RQCh. 2 - From a users perspective, what is the difference...Ch. 2 - Prob. R19RQCh. 2 - Prob. R20RQCh. 2 - Prob. R21RQCh. 2 - Prob. R22RQCh. 2 - Prob. R23RQCh. 2 - Prob. R24RQCh. 2 - Prob. R25RQCh. 2 - In Section 2.7, the UDP server described needed...Ch. 2 - Prob. R27RQCh. 2 - Prob. P1PCh. 2 - Prob. P2PCh. 2 - Prob. P3PCh. 2 - Prob. P4PCh. 2 - Prob. P5PCh. 2 - Prob. P6PCh. 2 - Prob. P7PCh. 2 - Prob. P8PCh. 2 - Prob. P9PCh. 2 - Prob. P10PCh. 2 - Prob. P11PCh. 2 - Prob. P13PCh. 2 - Prob. P14PCh. 2 - Prob. P15PCh. 2 - Prob. P16PCh. 2 - Prob. P17PCh. 2 - Suppose you can access the caches in the local DNS...Ch. 2 - Prob. P21PCh. 2 - Prob. P22PCh. 2 - Prob. P23PCh. 2 - Prob. P25PCh. 2 - Prob. P26PCh. 2 - Prob. P27PCh. 2 - Prob. P28PCh. 2 - Prob. P29PCh. 2 - Prob. P30PCh. 2 - Prob. P31PCh. 2 - Prob. P32P
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- It is important to sort DNS records based on the kind of record they are. Each one must include a thorough explanation, complete with illustrations and justifications of how it should be used. There is a possibility that a web server and an internal mail server might use the same hostname; however, is this even possible?arrow_forwardWhen a web client attempts to get access to protected resources hosted by a web server, it is important to demonstrate the step-by-step implementation of native authentication and authorization services. What are the two most persuasive arguments in favor of layered protocols and why should they be used? You need to provide specific examples to back up your point.arrow_forwardSort DNS records according to their kind. Give a short description of each with examples, as well as an explanation of why they are utilized. Is it feasible for a web server and a mail server in an organization to use the same alias for a hostname?arrow_forward
- Sort the information in a DNS record into its appropriate categories to learn its nature. Explain briefly how each is used, giving specific examples and expanding on the rationale behind your choices. Is it conceivable for a web server and e-mail server to have the same hostname in the same company?arrow_forwardConsider Figure 2.12, for which there is an institutional network connected to the Internet. Suppose that the average object size is 1,000,000 bits and that the average request rate from the institution’s browsers to the origin servers is 16 requests per second. Also suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is three seconds on average (see Section 2.2.5). Model the total average response time as the sum of the average access delay (that is, the delay from Internet router to institution router) and the average Internet delay. For the average access delay, use ∆/(1 - ∆b), where ∆ is the average time required to send an object over the access link and b is the arrival rate of objects to the access link. Find the total average response time. I get ∆=1000000/15000000= 1/15, then ∆/(1 - ∆b)= (1/15)/(1-(1/15)*16)=-1, so the finally answer is : 3+(-1)=2s or 3+0=3s?arrow_forwardList the DNS records according to the kind of record they include. Each one is used with an example and explained in context. Is it conceivable, in your opinion, to have a web server with the same name as an email server?arrow_forward
- DNS records should be sorted according to their record type. Each one has to be defined precisely, with illustrations and explanations of why it's useful. Is it feasible for a web server and an internal mail server to share a hostname?arrow_forwardStart by compiling a list of all of the various types of DNS records. Each one has to have a thorough explanation that includes real-world examples and a rationale for why it is employed. Are web servers and mail servers able to share the same hostname alias simultaneously?arrow_forwardSuppose that the average object size is 850,000 bits and that the average request rate from the institution’s browsers to the origin servers is 16 requests per second. Also suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is three seconds on average (see Section 2.2.5). Model the total average response time as the sum of the average access delay (that is, the delay from Internet router to institution router) and the average Internet delay. For the average access delay, use Δ/(1 – Δ ), where Δ is the average time required to send an object over the access link and is the arrival rate of objects to the access link. a. Find the total average response time.b. Now suppose a cache installed in the institutional LAN, Suppose the miss rate is 0.4. Find the total response time.arrow_forward
- A web client is required to first make use of the web server's native authentication and authorization services before they are allowed access to a web server's protected resources. Is there any additional benefit to use layered protocols except those listed here? It would be helpful if you could provide concrete examples to back up your claims.arrow_forwardSort DNS records into categories depending on the kind of data they include. Give a short description of each, including examples, as well as an explanation of why they are utilized. Is it feasible to have the same hostname alias for a web server and a mail server in the same company?arrow_forwardA web client is required to first make use of the web server's native authentication and authorization services before they are allowed access to a web server's protected resources. Is there any additional benefit to using layered protocols except those listed here? It would be helpful if you could provide concrete examples to back up your claims.arrow_forward
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