Exam 70-297 Highlighters Index | 369
Prep and
Practice
Pull partners should be configured for slow WAN links.
WINS replication can be scheduled for off-peak hours.
Designing a Network and Routing Solution
This subsection covers a summary of highlights from the “Designing a Network
and Routing Solution” section in the Exam 70-297 Study Guide.
IP address assignment
IP addresses configured manually are known as static IP addresses.
Automatic IP address assignment works on DHCP clients that do not find a
DHCP server on startup.
The APIPA IP address range is 169.254.0.0 to 169.254.255.254.
Clients configured with APIPA poll for a DHCP server every five minutes.
APIPA clients cannot connect to the Internet.
Alternate IP addressing is used in place of APIPA.
Alternate IP addressing is usually configured on portable computers.
Automatic IP addressing with DHCP
DHCP severs are used to automatically assign IP addresses to clients.
The DHCP server must be authorized in Active Directory to serve clients.
A DHCP client sends out a DHCP Discover broadcast message on the network.
The DHCP server with a valid IP address scope offers an IP address lease to
the client.
The DHCP client accepts the lease offer and requests the IP address from the
DHCP server.
The DHCP server that sent the IP lease offer to the DHCP client assigns the
IP address to the client for a period that is specified in the lease.
The default lease is for eight days.
DHCP scope
Every DHCP server has at least one active scope.
The scope contains the following configuration for the clients:
The range of IP addresses for clients.
The subnet mask for the network segment.
The period of the lease, which is eight days, by default.
DHCP scope options that include the addresses of the default gateway,
the DNS server, and the WINS server.
The exclusions range that specifies the IP addresses not to be assigned by
the DHCP server.
The reserved IP addresses for clients who should get the same IP
addresses every time.
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Chapter 6: Exam 70-297 Prep and Practice
DHCP scope options
DHCP scope options apply to all clients in the subnet.
Table 6-13 lists commonly used scope options.
DHCP Relay Agent
The DHCP Relay Agent is placed in smaller subnets where the DHCP server
cannot be placed.
One of the DHCP clients is configured as the DHCP Relay Agent.
The DHCP Relay Agent receives messages from DHCP clients and forwards
them to the DHCP server.
BOOTP-compliant (RFC 1542) routers can be used in place of DHCP Relay
Agents.
Number and placement of DHCP servers
DHCP servers should preferably be placed in every network segment.
DHCP servers should be placed locally on locations connected with slow
WAN links.
The number of DHCP servers depends on the number of clients on the
network.
Multiple DHCP servers should be installed for fault-tolerance.
The DHCP server should have high-speed processors and fast network
adapters.
Hard disks of DHCP servers should be fast and reliable.
DHCP servers should be physically secured.
Only authorized administrators should be granted access to the DHCP servers.
Internet connection options
Table 6-14 lists connection options for Internet.
Table 6-13. DHCP scope options
Option Description
003 Router This is the IP address of the default gateway or the router.
006 DNS Servers This is the IP address of the DNS server for the client.
015 DNS Domain Name This option configures the client with the DNS domain name.
044 WINS/NBNS Server This is the IP address of the WINS server for the client.
046 WINS/NBT Node Type This option specifies the node type for the client. The node type can be b-
node, h-node, p-node, or m-node.
Table 6-14. Internet connection options
Type of connection Type Speed
Dial-up modem Circuit Switched 56 Kbps
ISDN Circuit Switched ISDN Basic Rate Interface (BRI)-128 Kbps
ISDN Primary Rate Interface (PRI)-1.544 Mbps

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