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Lesson 3 Review
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Page 13-36
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1. What is a forward lookup query and how is it resolved
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A forward lookup query is the resolving of a user-friendly DNS domain name to an IP address. To resolve a forward lookup query, a client passes a lookup query to its local name server. If the local name server can resolve the query, it returns the IP address for the name so the client can contact it. If the local name server cannot resolve the query, it passes the query on to one of the DNS root servers. The DNS root server sends back a referral to a name server that can resolve the request. The local name server sends the request to the name server it was referred to by the DNS root server. An IP address is returned to the local name server and the local name server sends the IP address to the client.
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2. In DNS name resolution, which of the following statements about TTL are correct (Choose all that apply.) a. TTL is the length of time a query can exist before it is discarded. b. Shorter TTL values help ensure that data about the domain namespace is more current across the network. c. Longer TTL values increase the amount of DNS traffic. d. Longer TTL values cause the cached values to be retained longer.
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The correct answers are A, B, and D. C is not correct because longer TTL values do not increase DNS traffic, but shorter TTL values can increase it.
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3. Which of the following statements about DNS name and address resolution are correct (Choose all that apply.) a. The DNS distributed database is indexed by both names and IP addresses. b. The top-level domain in-addr.arpa is used for both forward and reverse queries. c. In the in-addr.arpa domain, the order of the IP address octets is reversed. d. Troubleshooting tools, such as the nslookup command-line tool, use reverse lookup queries to report back host names.
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The correct answers are C and D. A is not correct because the DNS database is indexed by name, not by IP address. B is not correct because the top-level domain in-addr.arpa is used for reverse lookup queries, but not for forward lookup queries.
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13
Supporting TCP/IP
Lesson 4 Review
Page 13-43
1. What is a HOSTS file, and when would you create one
A HOSTS file is a manually maintained local file that provides host-to-IP address resolution. You use a HOSTS file for networks without access to a DNS name server to provide host-to-IP address and NetBIOS-to-IP name resolution for applications and services.
2. Which of the following functions do you perform by using the Advanced TCP/IP Settings dialog box (Choose all that apply.) a. Edit the IP address of a DNS server. b. Delete the IP address of a DNS server. c. Enter additional IP addresses for other available DNS servers. d. Edit the IP addresses of the DHCP servers on the network.
The correct answers are A, B, and C. D is not correct because you do not configure addresses for DHCP servers by using the Advanced TCP/IP Settings dialog box.
3. What does selecting the Append These DNS Suffixes (In Order) option do
This option allows you to specify a list of domains to try when there is a query for an unqualified name. Queries are limited to the domains that you listed.
Case Scenario Exercise
Page 13-44
1. Andrew s notebook has a network adapter built-in. When he is at work, Andrew will connect the notebook to the company network. The company uses a DHCP server to provide IP addresses to computers on the network. How should you configure Andrew s computer to connect to the company network
You should configure Andrew s computer to obtain an IP address automatically. You can do this by opening the Properties dialog box for the LAN connection, opening the Properties dialog box for the TCP/IP protocol, and then selecting the Obtain IP Address Automatically option.
2. When Andrew is at home, he will connect his notebook computer to a digital subscriber line (DSL) modem supplied by his ISP. The ISP has issued Andrew a static IP address. How should you configure Andrew s computer so that it will use the static IP address when he is at home without interfering with the DHCP service on the company network
You should configure an alternate TCP/IP configuration on Andrew s computer. To do this, you must first make sure that his computer is configured to use automatic IP addressing as its primary configuration method. You can do this by opening the Properties dialog box for the LAN connection, opening the Properties dialog box for the TCP/IP protocol, and then selecting the Obtain IP Address Automatically option. When Windows XP Professional is configured to obtain an address automatically, an Alternate Configuration tab becomes available in the Internet Protocol (TCP/IP) Properties dialog box. On this tab, select the User Configured option and enter the appropriate IP address, subnet mask, default gateway, and DNS server addresses provided by the ISP .
Questions and Answers 13-53
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