Instructions
- Enter Cisco IOS commands on device to verify network operation and answer for multiple-choice questions.
- THIS TASK DOES NOT REQUIRE DEVICE CONFIGURATION.
- Click the device icon to gain access to the console of the router. No console or enable passwords are required.
- To access the multiple-choice questions, click the numbered boxes on the left of the top panel.
- This task has four multiple-choice questions. Be sure to answer all four questions before clicking the Next button.

Scenario
You are implementing PPP over serial links between R1 router and branch offices. In Phase 1 you must implement and verify PPP and GRE tunnel configurations
as mentioned in the topology. In Phase 2 your colleague is expected to do NAT and ISP configurations between R1 and ISP router.
Identify the issues that you encounter during PPP over serial links implementation.
Routers Branch1, Branch2, and Branch3 connect to Router R1 in the main office over serial links.
PPP multilink implementation is recommended between R1 and Branch1 routers.
The GRE tunnel is configured between R2 and Branch2 routers, and traffic between Server farm1 10.10.10.0/24 network and Branch2 LAN 10.10.20.0/24 network,
is routed over GRE tunnel using static route.

You have console access on R1, R2, Branch1, Branch2, and Branch3 devices. Use only show commands to troubleshoot the issues.

R1#show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet0/0 172.16.10.1 YES manual up up EthernetO/l 203.1.1.2 YES manual up up Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 unassigned YES unset up up Serial1/1 unassigned YES unset up up Serial1/2 192.168.16.1 YES manual up down Serial1/3 192.168.15.1 YES manual up up Multilink1 192.168.14.1 YES manual up up NVI0 unassigned YES unset up up
Branch1#show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet0/0 10.10.20.1 YES manual up up Ethernet0/1 192.168.11.1 YES manual up up Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 192.168.15.2 YES manual up up Serial1/1 unassigned YES unset administratively down down Serial1/2 unassigned YES unset administratively down down Serial1/3 unassigned YES unset administratively down down Tunnel0 192.168.24.2 YES manual up up
Why did Branch1 router lose WAN connectivity with R1 router?

A.	The IP address is misconfigured on PPP multilink interface on the Branch1 router.
B.	The PPP multilink group is misconfigured on the Branch1 serial interfaces.
C.	The PPP multilink group in misconfigured on the R1 serial interfaces.
D.	The Branch1 serial interfaces are placed in a shutdown condition.