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.

Branch3#show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet0/0 192.168.10.1 YES manual up up Ethernet0/1 unassigned YES unset administratively down down Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 192.168.16.2 YES manual up down Serial1/1 unassigned YES unset administratively down down Serial1/2 unassigned YES unset administratively down down Serial1/3 unassigned YES unset admin!stratively down down Branch3# show running-config <output omitted> interface Serial1/0 ip address 192.168.16.2 255.255.255.252 encapsulation ppp ppp chap hostname Branch_3 ppp chap password 0 Branch3_Secret! serial restart-delay 0 <output omitted>

Rl#show running-config <output omitted> interface Serial1/2 ip address 192.168.16.1 255.255.255.252 ip nat inside ip virtual-reassembly in encapsulation ppp ppp authentication chap serial restart-delay 0 ! <output omitted> ! username Branch2 password 0 Branch2_Secret! username Branch3 password 0 Branch3_Secret! !

Why has the Branch3 router lost connectivity with R1?
Use only show commands to troubleshoot because usage of the debug command is restricted on the Branch3 and R1 routers.