Refer to the exhibit. What is the meaning of the term dynamic as displayed in the output of the
show frame-relay map command shown?
A.
The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned
through Inverse ARP.
B.
The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay
cloud.
C.
The DLCI 100 was dynamically allocated by the router.
D.
The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server.
E.
The Serial0/0 interface is passing traffic.
Explanation:
Inverse Address Resolution Protocol (Inverse ARP) was developed to provide a mechanism for
dynamic DLCI to Layer 3 address maps. Inverse ARP works much the same way Address
Resolution Protocol (ARP) works on a LAN. However, with ARP, the device knows the Layer 3 IP
address and needs to know the remote data link MAC address. With Inverse ARP, the router
knows the Layer 2 address which is the DLCI, but needs to know the remote Layer 3 IP address.
When using dynamic address mapping, Inverse ARP requests a next-hop protocol address for
each active PVC. Once the requesting router receives an Inverse ARP response, it updates its
DLCI-to-Layer 3 address mapping table. Dynamic address mapping is enabled by default for all
protocols enabled on a physical interface. If the Frame Relay environment supports LMI
autosensing and Inverse ARP, dynamic address mapping takes place automatically. Therefore, no
static address mapping is required.