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Answers to Exam Prep Questions

  1. The correct answer is C. The Network layer is responsible for translating logical network address and names, such as computer names, to their MAC addresses and for addressing and routing data packets over the network. The Transport layer adds another connection below the Session layer and helps manage data flow control between nodes on the network. Therefore, answer A is incorrect. The Physical layer defines the interface between the medium and the device. Therefore, answer B is incorrect. The Data Link layer mainly handles error correction, flow control, and communication with the network adapter card. Therefore, answer D is incorrect.
  2. The correct answer is B. You should place two DHCP servers in each office and place them in cluster configurations. This solution minimizes network traffic on the WAN link and eliminates DHCP as a single point of failure. Answers A, C, and D are incorrect. By placing the only DHCP servers in the head office, DHCP clients in the branch office must rely on the availability of the WAN link to obtain an IP address.
  3. The correct answer is D. The division point between the network ID and the host ID is called the subnet mask. The subnet mask is used to determine where the network number in an IP address ends and the node number in an IP address begins. Therefore, answers A, B, and C are incorrect.
  4. The correct answer is C. The subnet mask of 255.255.255.240 allows for a maximum amount of 16 subnets. This meets the requirements for 12 subnets. Answers A and B are incorrect because these subnet masks do not allow for enough subnets. Answer D is incorrect because this subnet mask allows for more subnets than will ever be required.
  5. The correct answers are A and B. CIDR is supported by RIP version 2 and OSPF routing. Because CIDR supports multiple subnet masks per subnet, it requires routers that support more advanced interior routing protocols, such as RIP version 2 and OSPF. CIDR isn't supported by RIP version 1 or EGP; therefore, answers C, D, and E are incorrect.
  6. The correct answer is B. Each subnet has its own gateway, so the 003 router option should be configured at the scope level instead of the server level. Answers A and C are incorrect because all clients are successfully leasing IP addresses. Answer D is incorrect because DHCP options do not have to be activated.
  7. The correct answer is E. Given the Class C IPv4 address 192.199.199.0, you can use a subnet mask of 255.255.255.240 and create 16 subnetworks with 14 hosts per subnet. Because the question called for at least 17 subnetworks with at least 13 hosts per subnet, the only correct answer is E.
  8. The correct answer is C. WINS replication can be "pulled" on an interval or "pushed" after a set number of changes to the database; therefore, answers A and B are incorrect because they can be set to push after a number of changes and answer D is incorrect because it is not a valid type of WINS replication.
  9. The correct answer is B. MTUs are based on the type of network that is installed. Ethernet deployments are limited to a 1,500 byte MTU. Therefore, answers A, C, and D are incorrect.
  10. The correct answer is D. To maximize security, they should use a name on the inside of the firewall that is totally different than their public name; therefore, answers A, B, and C are incorrect because they still contain the "contoso" name.
  11. The correct answer is B. To enable APIPA on clients, all you need to do is configure the client to use DHCP (obtain an IP address automatically). When the client starts up and cannot contact a DHCP server, it assigns itself an IP address from the reserved 169.254.0.0 range with a subnet mask of 255.255.0.0. No default gateway is used, and systems that use APIPA are not routable. Therefore, answers A, C, and D are incorrect.
  12. The correct answer is D. Caching-Only DNS servers do not host a zone and therefore do not have any zone transfer traffic. Active Directory Integrated zones can be hosted only on domain controllers. Even if you installed a domain controller at the remote office, you would then create replication traffic for the domain controller; therefore, answer A is incorrect. Primary and Secondary servers host a zone and create transfer traffic; therefore, answers B and C are incorrect.
  13. The correct answers are B, C, and D. When a DHCP client request for an IP address hits a non-RFC-1542–compliant router (meaning the DHCPDISCOVER broadcast message is not forwarded off the subnet), it fails to receive a response because the DHCP server never receives the DHCPDISCOVER broadcast message and the client system configures itself with an APIPA address. If a DHCP Relay Agent is in use on the subnet, it receives the DHCPDISCOVER broadcast message and routes the message off the subnet to the DHCP server. Subsequently, when the DHCP server responds with an address and the DHCP client selects the IP address, the client responds with a DHCPREQUEST broadcast message, which includes the IP address of the server that had its offer accepted. Again, this DHCPREQUEST broadcast message does not get out of this subnet unless a DHCP Relay Agent is in use on the subnet, and can receive the DHCPREQUEST broadcast message and forward (route) the message off the subnet to the DHCP server.
  14. The correct answer is D. By configuring caching-only servers within each location, you can decrease the name resolution response time for users. Because the caching-only servers do not maintain any zone information, no traffic is generated from zone transfers. Therefore, answers A, B, and C are incorrect.
  15. The correct answer is B. Two types of queries can be performed in DNS: iterative and recursive. The situation described in this scenario is an iterative query. A recursive query happens when a client makes a DNS resolution query to a DNS server, and the server assumes the full workload and responsibility for providing a complete answer to the query, therefore, answer A is incorrect. Forward and cache queries are not applicable; therefore, answers C and D are incorrect.
  16. The correct answer is A. Any BIND server running version 4.9.4 or later supports fast zone transfers. By disabling the BIND secondaries option, SRV01 will perform fast zone transfers with DNS01. Therefore, answers B, C, and D are incorrect.
  17. The correct answers are A, D, and E. Caching-only DNS servers perform name resolution on behalf of clients and then cache the resulting name resolutions. They are not configured to be authoritative for a DNS zone, and they do not store Standard Primary or Standard Secondary zones locally. Their local cache holds the most frequently requested names and associated IP addresses and are available for use by subsequent client queries.
  18. The correct answer is D. When dealing with clients that dynamically update their own DNS records, host record registration often fails because the primary DNS suffix listed on the client machine does not match the DNS zone name. For example, the actual Active Directory domain and DNS domain is gunderville.com, but the computer has a primary DNS suffix listed as 2000trainers.com. This causes the system to attempt to register at 2000trainers.com, which it usually is not authorized to do.
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