Which field of the IP header is modified on a payload packet when using GRE?

You must create an IP-IP tunnel between two routers on your network. These two devices are
separated by 10 hops. The tunnel appears to be established, but no traffic is traversing the tunnel.
What causes this behavior?

Which three statements are true about tunnels? (Choose three.)

Refer to the Exhibit.

You want traffic destined for the 66.142.1.0/24 network to traverse an IP-IP tunnel. You notice
traffic being sent to any address in that subnet is not being received. Upon reviewing the output
shown in the exhibit, what is the problem?

An IP-IP tunnel must meet which two requirements to function correctly? (Choose two.)

A GRE tunnel is established between two routers. When a user on one end sends traffic with a
large packet size to a user on the remote end, the packet never arrives. However, the problem
does not exist for smaller packets. What is the problem?

You have created an IP-IP tunnel which will traverse interface at-0/1/0 and you would like to make
sure that the tunnel is operational. Which operational-mode command should you use to verify that
the IP-IP tunnel interface is up?

Refer to the Exhibit.

Devices S1 and S2 have the interface configurations as shown in the exhibit. You attach ge-0/0/0
on S1 to ge-0/0/0 on S2. You attach ge-0/0/1 on S1 to ge-1/0/20 on S2. However, the ae0
interface remains down on both S1 and S2. What should you change to cause the ae0 interface to
come up?

You want to configure a redundant trunk group on a switch. You want ge-0/0/0.0 to be the default
link; however, if ge-0/0/0.0 fails and the switch begins using ge-0/0/1.0, you want the switch to
continue using ge-0/0/1.0 until ge-0/0/1.0 fails. Which configuration will accomplish this scenario?

Which three steps must you complete for an aggregated Ethernet configuration on a switch?
(Choose three.)