200-301 Question #136: Real Exam Question with Answer & Explanation

Question

You are configuring your edge routers interface with a public IP address for Internet connectivity. The router needs to obtain the IP address from the service provider dynamically. Which command is needed on interface FastEthernet 0/0 to accomplish this?

Options

• Aip default-gateway
• Bip route
• Cip default-network
• Dip address dhcp
• Eip address dynamic

Explanation

To configure a router interface to dynamically obtain an IP address from a service provider, the ip address dhcp command is used, enabling the interface to act as a DHCP client.

Common mistakes.

• A. The ip default-gateway command specifies the gateway of last resort for the router itself, not for obtaining an IP address dynamically on an interface.
• B. The ip route command is used to configure static routes in the routing table, not to dynamically assign an IP address to an interface.
• C. The ip default-network command is an older method to establish a default route by designating a network that exists in the routing table, not for dynamic IP assignment.
• E. ip address dynamic is not a valid Cisco IOS command for configuring dynamic IP address acquisition on an interface.

Concept tested. Router interface DHCP client configuration

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_cfg/configuration/xe-16/ipaddr-cfg-xe-16-book/ipaddr-cfg-interfaces.html#GUID-E1DF78EC-7B67-4AF3-8869-7117C324316D

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