Alcatel Lucent Scalable IP Networks Set 3

When the router first receives a frame from a LAN. ✘ After the forwarding table is checked. ✘ After the IP datagram is extracted from the L2 frame. ✘ Immediately before the IP packet is encapsulated for transmission. ✔

The IP datagram is encapsulated in the appropriate Layer 2 frame by the MDA. ✘ The IP datagram passes through the switch fabric to reach the egress IOM. ✘ The IP datagram is passed to the IOM. ✘ A lookup is performed in the FIB to determine the egress interface. ✔

Header checksum. ✘ Fragmentation offset. ✘ Flags. ✘ Identification. ✔

To limit the number of the IP addresses in the network. ✘ To improve the efficiency of transmissions over the network. ✘ To reduce the number of resources required to send a large frame over the network. ✘ To allow IP datagrams to be carried over Layer 2 networks with varying MTU sizes. ✔

Resolves a Mac address given a specific IP address. ✘ Allows a single public IP address to represent multiple private IP addresses simultaneously. ✘ Maps a private address to a well known port number. ✘ Provides a one to one mapping from a private to a public address. ✔

IP routing. ✘ IP protocol. ✘ IP encapsulation. ✘ IP tunneling. ✔

Preference. ✘ Metric. ✘ Dest prefix. ✘ Next hop. ✔

Based on the metrics of the routing protocol, find the best path to the destination network and install it in the routing table. ✘ Provide a CLI interface to allow the operator to configure the dynamic routing protocol on the router. ✘ Based on the routing protocol preference values, chose the route with the lowest preference and install it in the routing table. ✘ Provide a CLI interface to allow the network operator to install static routes in the routing table. ✔

Responds in real time to network failures. ✘ Can only be used for routing within an autonomous system. ✘ Uses a hop-count metric to determine the best route to a network. ✘ Explicitly defines the next hop based on operator input. ✔

An entry included in the default configuration of the router that is used if no dynamic routing protocols or static routes are configured. ✘ A wildcard entry used when the destination network is not specifically defined in the routing table. ✘ An entry selected based on the route that has the least cost to the destination (path with the most physical bandwidth) ✘ An entry used by the routing protocol when it is unable to calculate the best route to the destination. ✔