$**$Configuration Problem: Understanding NBMA for OSPF$**$

In this Packet Tracer configuration problem, you will be tasked with configuring OSPF $($Open Shortest Path First$)$ on a Non$-$Broadcast Multi$-$Access $($NBMA$)$ network topology. The objective is to understand how OSPF operates on an NBMA network, including the roles of Designated Router $($DR$)$ and Backup Designated Router $($BDR$).$

$**$Topology Design:$**$

$-$ Design a network topology consisting of four routers interconnected through a NBMA cloud$($use a switch$).$

$-$ Each router should be connected to the NBMA cloud using serial interfaces.

$-$ Assign the following IP addresses to each router interface:

$-$ Router $1$:

$-$ Serial$0/0/0$: $192\mathrm{.}168\mathrm{.}1\mathrm{.}1/24$

$-$ Router $2$:

$-$ Serial$0/0/0$: $192\mathrm{.}168\mathrm{.}1\mathrm{.}2/24$

$-$ Router $3$:

$-$ Serial$0/0/0$: $192\mathrm{.}168\mathrm{.}1\mathrm{.}3/24$

$-$ Router $4$:

$-$ Serial$0/0/0$: $192\mathrm{.}168\mathrm{.}1\mathrm{.}4/24$

$**$Configuration Tasks:$**$

$1.$ Configure OSPF on each router with the following parameters:

$-$ OSPF Process ID: $1$

$-$ Enable OSPF on all serial interfaces connected to the NBMA cloud.

$-$ Set OSPF priority on one router to ensure it becomes the DR$.$

$-$ Set OSPF priority on another router to ensure it becomes the BDR$.$

$2.$ Verify OSPF adjacency and neighbor relationships:

$-$ Use OSPF show commands to verify OSPF neighbors and adjacency formation.

$-$ Identify the DR and BDR routers using OSPF neighbor information.

$3.$ Test OSPF functionality:

$-$ Ping between routers to verify connectivity across the NBMA network.

$-$ Verify routing table entries on each router to confirm OSPF routes are learned and propagated correctly.

$**$Documentation:$**$

$-$ Document OSPF configurations for each router, including OSPF process ID$,$ priority settings, and interface configurations.

$-$ Provide screenshots or diagrams illustrating OSPF neighbor relationships and DR$/$BDR election results.

$-$ Include a brief explanation of OSPF operation on an NBMA network and the significance of DR and BDR roles.

$**$Exam Guidelines:$**$

$-$ Refer to Cisco documentation and resources for assistance if needed.

$-$ Ensure configurations adhere to OSPF best practices and guidelines.

$-$ Save your configurations and documentation for submission.