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Exam Prep Questions

Question 1

Which OSI 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?

  1. Transport layer

  2. Physical layer

  3. Network layer

  4. Data Link layer

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.

Question 2

How is the division point between the network ID and the host ID of an IP address calculated?

  1. The Internet Engineering Task Force (IETF) sets the standard for calculating the division point.

  2. The Least Significant Bit (LSB) is used.

  3. The Most Significant Bit (MSB) is used.

  4. A subnet mask is used.

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.

Question 3

Which routing protocols support Classless Inter-Domain Routing (CIDR)? (Choose two.)

  1. RIP version 2

  2. Open Shortest Path First (OSPF)

  3. RIP version 1

  4. Exterior Gateway Protocol

  5. Interior Gateway Protocol

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.

Question 4

Given the Class C IPv4 address range of 192.199.199.0, can you use a subnet mask of 255.255.255.240 and create at least 17 subnetworks with at least 13 hosts per subnet?

  1. Yes, you can use a subnet mask of 255.255.255.240 and create at least 17 subnetworks with at least 13 hosts per subnet.

  2. No, the subnet mask of 255.255.255.240 is invalid for the Class C version 4 IP address ranges.

  3. 192.199.199.0 is not a Class C address range.

  4. No, there would be less than 13 hosts per subnet.

  5. No, there would be less than 17 subnetworks.

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.

Question 5

Maximum Transmission Units (MTUs) are based on the type of network that is installed. What is the MTU of ethernet networks?

  1. 1,460 bytes

  2. 1,500 bytes

  3. 4,464 bytes

  4. 17,914 bytes

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.

Question 6

How do you configure clients to use APIPA addressing?

  1. APIPA addressing needs to be set manually in the Registry.

  2. The client needs to be configured to obtain an IP address auto- matically.

  3. The client needs to have the APIPA option selected in the IP Properties dialog box.

  4. The DHCP server needs to have an APIPA scope configured and authorized.

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.

Question 7

When a DHCP client request for an IP address hits a router that cannot forward the DHCPDISCOVER broadcast message, the client fails to receive a response from the DHCP server because the DHCP server never receives the DHCPDISCOVER broadcast message. The client system configures itself with an APIPA address. What can be done to correct this problem? (Choose three.)

  1. Install an RFC 1452–compliant router.

  2. Install an RFC 1542–compliant router.

  3. Install DHCP Relay Agent on the client subnet.

  4. Install a local DHCP server.

  5. Install a DHCP Relay Agent on the DHCP server.

  6. Install a DHCP Relay Agent on the DHCP server subnet.

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.

Question 8

What type of DNS resolution involves a query made from a client to a DNS server, and the server returns the best answer it can provide based on its local cache or stored zone data?

  1. Recursive query

  2. Iterative query

  3. Forward query

  4. Cache query

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 resoluiotn query to a DNS server, and the server assumes the full workload and responsibility for providing a complere answer to the query, therfore, answer A is incorrect.

Question 9

What are some of the benefits of caching-only DNS servers? (Choose three.)

  1. Local sites that use them do not use WAN bandwidth for DNS resolutions.

  2. They hold a read/write copy of the DNS database on the local site.

  3. Replication is configurable for off hours, thus limiting the impact of zone transfer traffic.

  4. They do not produce any zone transfer traffic.

  5. They reduce traffic across a WAN because they attempt to locate information in their cache to resolve local client requests.

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.

Question 10

When clients dynamically update their own DNS records, what type of host record registration failures can occur?

  1. Incorrect parent DNS suffix listed

  2. Incorrect DNS suffix list entry appended

  3. Incorrect secondary DNS suffix listed

  4. Incorrect primary DNS suffix listed

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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