MCTS 70-642 DHCP Configuration & IP Address Management 2 — Questions and Answers
Question 1: What Windows Server 2008 DHCP feature allows a single DHCP server to serve multiple subnets by grouping scopes?
- Multicast scope
- Superscope (Correct answer)
- Split scope
- DHCP relay
Correct answer: Superscope
A superscope groups multiple scopes together, allowing a single DHCP server to service clients from multiple subnets on the same physical network.
Question 2: Which protocol allows DHCP requests to be forwarded from one subnet to a DHCP server on a different subnet?
- BOOTP/DHCP relay agent (Correct answer)
- Dynamic DNS
- NAT
- IGMP
Correct answer: BOOTP/DHCP relay agent
A DHCP relay agent (based on BOOTP) forwards DHCP broadcast messages across subnet boundaries to a DHCP server on another subnet.
Question 3: What must be done in Windows Server 2008 before a DHCP server can begin leasing IP addresses?
- Install DNS
- Authorize the DHCP server in Active Directory (Correct answer)
- Create a WINS server
- Enable IPsec
Correct answer: Authorize the DHCP server in Active Directory
In an Active Directory environment, a DHCP server must be authorized in AD before it can service client requests, preventing rogue DHCP servers.
Question 4: What DHCP option specifies the DNS server addresses for clients?
- Option 3
- Option 6 (Correct answer)
- Option 15
- Option 51
Correct answer: Option 6
DHCP Option 6 (DNS Servers) provides clients with the IP addresses of DNS servers to use for name resolution.
Question 5: What is a DHCP multicast scope used for?
- Assigning multiple IPs to one client
- Assigning Class D IP addresses to multicast group members (Correct answer)
- Providing IPv6 addresses
- Assigning IPs to VPN clients
Correct answer: Assigning Class D IP addresses to multicast group members
A DHCP multicast scope assigns Class D IP addresses (224.0.0.0–239.255.255.255) to multicast group members using the MADCAP protocol.
Question 6: When a DHCP client's lease reaches 50% of its duration, what action does the client take?
- Releases and requests a new IP
- Attempts to renew with the original DHCP server (unicast) (Correct answer)
- Broadcasts for any available DHCP server
- Applies an APIPA address
Correct answer: Attempts to renew with the original DHCP server (unicast)
At 50% lease time (T1), the DHCP client sends a unicast renewal request directly to the DHCP server that issued the lease.
MCTS 70-642 DHCP Configuration & IP Address Management 2
What Windows Server 2008 DHCP feature allows a single DHCP server to serve multiple subnets by grouping scopes?