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QUESTION 1:
You work as the network administrator at Certkiller .com. Certkiller .com network
consists of a single Active Directory domain named Certkiller .com with sites. All
servers on the Certkiller .com network run Windows Server 2003 and all client
computers run Windows XP Professional. Certkiller .com has its headquarters in
Chicago and a branch office in Dallas. Each location is configured as a separate site.
The Chicago headquarters office contains 3 domain controllers and the Dallas
branch office contains 1 domain controller. The domain controllers on the network
are configured as DNS servers, using an Active Directory integrated zone. All
computers on the network are DHCP clients, and are assigned IP addressing

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information through the DHCP Server service. A server named Certkiller -SR05
runs the DHCP Server service. The Chicago headquarters office and Dallas branch
office are connected through a leased line, which is routed using the RIPv1 routing
protocol.
You are responsible for defining the IP addressing scheme for Certkiller .com. You
are instructed to use Classless Interdomain Routing (CIDR) to supernet a number
of class C addresses. You need to perform this task as soon as possible because the
Certkiller .com internal network is running short of IP addresses at the Chicago
headquarters office. You need to determine whether the existing network will
support CIDR, and if not, you need to implement the necessary changes.
What should you do?
A. You do not need to change anything to support CIDR.
B. You must use the RIPv2 routing protocol.
C. You need to assign a static IP address to all computers on the network.
D. All domain controllers have to reside in one site.
Answer: B
Explanation: CIDR allow subnets to be further subnetted, by allowing you to
configure network subnets that meet the requirements of your organization. CIDR
also makes it possible for your routers to handle different subnet masks. CIDR does
however require a routing protocol that supports the sending of the subnet mask in
its routing updates. The routing protocols that support CIDR or VLSM are: RIPv2,
OSPF, IS-IS, EIGRP, and BGP-4. The routing protocols do not support CIDR are:
RIPv1; IGRP; and EGP. The question states that the Chicago headquarters office
and Dallas branch office are connected through a leased line, which is routed using
the RIPv1 routing protocol. You therefore have to use the RIPv2 routing protocol if
you need to use CIDR.
Incorrect answers:
A: Because RIPv2 does not support CIDR or VLSM, you need to change your current
routing protocol to RIPv2.
C: There is no need to assign a static IP address to all computers on the network. You
can use the DHCP Server service to assign CIDR addresses to computers.
D: Even though CIDR is only to be used at the Chicago office site, and not at the branch
office site; there is no need to place all domain controllers in a single site. CIDR supports
the location of domain controllers in different sites.
QUESTION 2:
You work as the network administrator at Certkiller .com. Certkiller .com network
consists of a single Active Directory domain named Certkiller .com. All servers on the
Certkiller .com network run Windows Server 2003 and all client computers run
Windows XP Professional. A server named Certkiller -SR26 runs the DHCP
Server service. The two file servers on the network are named Certkiller -SR03

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and Certkiller -SR04.
The Certkiller .com network is segmented into two subnets:
1. Subnet 192.168.11.0 contains the DHCP server, Certkiller -SR03, and several
client computers.
2. Subnet 192.168.12.0 contains Certkiller -SR04 and several client computers.
The current scope configuration of Certkiller -SR26 is as follows:
1. Range 192.168.11.10 – 192.168.11.200.
2. Range 192.168.12.10 – 192.168.12.200.
You replace the router running between Subnet 192.168.11.0 and Subnet
192.168.12.0 with a router that does not support BOOTP forwarding. You
immediately receive complaints from a user named Mia Hamm that resides in
Subnet 192.168.12.0. Mia Hamm can no longer connect to the Certkiller .com
corporate network from Subnet 192.168.12.0. You suspect that Mia Hamm’s client
computer was unable to renew its IP address. Mia Hamm uses a client computer
named Certkiller -WS166. You discover that the IP assigned to
Certkiller -WS166 is 169.254.3.8.
You need to ensure that Mia Hamm can connect to the Certkiller .com corporate
network from Subnet 192.168.12.0 using Certkiller -WS166. You do not want to
add another DHCP server in Subnet 192.168.12.0. You also do not want other client
computers in Subnet 192.168.12.0 experiencing the same issue.
What should you do?
A. On Certkiller -SR04 in Subnet 192.168.12.0, enable the DHCP Relay Agent.
B. On Certkiller -SR26 in Subnet 192.168.11.0, enable the DHCP Relay Agent.
C. On Certkiller -SR03 in Subnet 192.168.11.0, enable the DHCP Relay Agent.
D. Use an alternate IP configuration to assign IP addressing configuration to
Certkiller -WS166.
Answer: A
Explanation: The router will drop DHCP broadcast messages if it is not configured
to forward them, and no DHCP Relay Agent exists. Similarly, the DHCP lease
process would not be able to occur. The initial message sent by a DHCP client is a
broadcast message. In your scenario, the new router does not support BOOTP
forwarding. In a routed network, you would need DHCP Relay Agents if you plan to
implement only one DHCP server. To enable clients to obtain IP addresses from a
DHCP server on a remote subnet, you have to configure the DHCP Relay Agent on
the subnet that contains the remote clients (Subnet 192.168.12.0), so that it can relay
DHCP broadcast messages to your DHCP server in Subnet 192.168.11.0.
Incorrect answers:
B, C: The DHCP Relay Agent must reside in the subnet that does not contain a DHCP
server. Subnet 192.168.11.0 contains the DHCP server.
D: You would usually configure alternate IP address configuration parameters when the
DHCP server cannot be accessed. Configuring the alternate IP address configuration is
ideal for laptop computers which connect to a number of different networks. In your case,
enabling the DHCP Relay Agent on Certkiller -SR04 in Subnet 192.168.12.0 would

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resolve the issue of client computers in Subnet 192.168.11.0 not being able to access the
DHCP server.
QUESTION 3:
HOTSPOT
You work as the network administrator at Certkiller .com. Certkiller .com network
consists of a single Active Directory domain named Certkiller .com. All servers on the
Certkiller .com network run Windows Server 2003 and all client computers run
Windows XP Professional.
The Certkiller .com network consists of an internal private network and a perimeter
network. The Certkiller .com corporate network consists of three subnets named
SubnetA, SubnetB, and SubnetC. An Internet connection is allowed through the
perimeter network connected to SubnetA. Two firewalls secure the corporate
network from unauthorized Internet access. SubnetA is connected to SubnetB and
SubnetC via dial-up links.
You install the DNS Server service on a domain controller named
Certkiller -DC01. You plan to configure the DNS server to support name
resolution for the Certkiller .com domain. You need to determine where to locate the
DNS server. You want to place the DNS server so that host resolution traffic is
minimized. You want to minimize expose of the DNS server to the Internet.
What should you do? To answer, select the appropriate Subnet in which the DNS
server should be installed.
Answer:

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Explanation:
Placing the DNS server in SubnetA is the best placement strategy:
1. The DNS server is secure from Internet users.
2. The DNS server will be accessible by all subnets.
3. Each local host resides one hop from the DNS server.
4. Minimized host resolution traffic.
If you place the DNS server in either of the other two subnets, more host resolution
traffic will be generated than what would be if it is located in Subnet
A. This is because of
all host resolution traffic between the two other subnets having to move through
Subnet
A. Placing the DNS server on the perimeter network will expose the DNS server
to the Internet.
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