MCTS 70-642 Technology & Digital Applications 2 — Questions and Answers
Question 1: A Windows Server 2008 R2 DHCP server is not issuing addresses to clients on a remote subnet. The router between the subnets supports RFC 3046. What must be configured to resolve this?
- Enable DHCP relay agent on the router
- Add a DHCP scope for the remote subnet and configure a DHCP relay agent (Correct answer)
- Install a second DHCP server on the remote subnet
- Configure the DHCP server with a superscope
Correct answer: Add a DHCP scope for the remote subnet and configure a DHCP relay agent
A DHCP relay agent (or IP helper address) must forward DHCP broadcasts across routers, and a scope covering the remote subnet must exist on the DHCP server.
Question 2: You need to prevent a specific client from receiving a DHCP lease while still allowing all other clients on the subnet to obtain addresses. What is the most efficient approach?
- Delete the DHCP scope and recreate it excluding the client's MAC
- Add the client's MAC address to the DHCP exclusion range
- Create a reservation with an invalid IP for the client (Correct answer)
- Add the client's IP to the deny list in Windows Firewall
Correct answer: Create a reservation with an invalid IP for the client
Creating a reservation tied to the client's MAC address with an address outside the scope effectively blocks it while keeping the scope intact for other clients.
Question 3: Which Windows Server 2008 R2 feature allows administrators to assign IPv6 addresses automatically to hosts that do not support DHCPv6?
- DHCPv4 with option 43
- Stateless Address Autoconfiguration (SLAAC) (Correct answer)
- ISATAP tunneling
- 6to4 relay
Correct answer: Stateless Address Autoconfiguration (SLAAC)
SLAAC allows IPv6 hosts to self-configure addresses using the network prefix advertised by routers without a DHCPv6 server.
Question 4: An administrator configures a secondary DNS zone on a Windows Server 2008 R2 server. The zone fails to transfer from the primary. What is the most likely cause?
- The secondary server's IP is not listed in the primary zone's Name Servers tab or zone transfer settings (Correct answer)
- The secondary zone must be converted to a stub zone first
- Active Directory replication is not configured
- The TTL on the primary zone is set too low
Correct answer: The secondary server's IP is not listed in the primary zone's Name Servers tab or zone transfer settings
By default, zone transfers are restricted to servers listed in the Name Servers tab or explicitly allowed in zone transfer settings on the primary.
Question 5: A technician needs to verify that DNS name resolution is working correctly for an internal hostname on a Windows Server 2008 R2 network. Which command provides the most detailed diagnostic output?
- ping hostname
- ipconfig /displaydns
- nslookup hostname (Correct answer)
- netstat -n
Correct answer: nslookup hostname
nslookup queries the DNS server directly and displays the server used, the resolved name, and the returned IP address.
Question 6: Which DNS record type is used to map an IPv6 address to a hostname in a forward lookup zone?
- A
- AAAA (Correct answer)
- PTR
- MX
Correct answer: AAAA
AAAA records store 128-bit IPv6 addresses and are the IPv6 equivalent of the A record used for IPv4.
Question 7: A company wants to implement Network Access Protection (NAP) using 802.1X enforcement. Which server role component must be installed and configured as the policy enforcement point?
- DHCP Server
- Network Policy Server (NPS) (Correct answer)
- Routing and Remote Access (RRAS)
- Active Directory Certificate Services
Correct answer: Network Policy Server (NPS)
NPS acts as the RADIUS server and NAP policy server, enforcing health policies for 802.1X-connected clients.
MCTS 70-642 Technology & Digital Applications 2
A Windows Server 2008 R2 DHCP server is not issuing addresses to clients on a remote subnet.
The router between the subnets supports RFC 3046.
What must be configured to resolve this?