BGP uses which underlying protocol to establish connection to peers?

On an edge router, you want to create a default route with a next hop to an external connection.
The route should be available only when you are receiving routes from the external provider.
Which type of route would you configure on your device to accomplish this objective?

Which configuration command would you use to add an IPv6 static route to your Junos device?

You configured an aggregate route of 192.168.8.0/21 and committed the updated configuration.
Using an operational show command, you notice that the newly configured route is not present in
the output. What would explain this behavior?

In the output shown in the exhibit, which protocol does the route display?

You want several different subnets within your enterprise network to be reachable from outside the
enterprise network. Your edge router must share a single route advertisement about these
subnets with external devices. If one of the subnets is unavailable, your edge router should drop
any traffic destined to that subnet. Which type of route, configured on the edge device with default
behavior, accomplishes these objectives?

You run the operational-mode command show ospf neighbor and notice that an expected OSPF
neighbor on a broadcast link is not detected. Which three issues cause this behavior? (Choose
three.)

You execute the operational-mode command show ospf neighbor and notice that one neighbor
relationship remains in the exStart state. What causes this behavior?

You are viewing the Ethernet switching table and notice that a previous entry is no longer listed.

What is a valid reason for an entry to be removed from the table?

Which mechanism keeps a switch from forwarding Layer 2 traffic from one broadcast domain to
another?