A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

Correct Answer:CDE
IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network12. It supports multiple protocol topologies, including IPv4, IPv6, and multicast12. Therefore, options C, E, and D are correct.

Which two statements are true about the default VLAN on Juniper switches? (Choose two.)

Correct Answer:AD
On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default12. This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN12. Therefore, option A is correct.
The default VLAN ID can be changed12. This allows network administrators to configure the switch to use a different VLAN as the default, if necessary12. Therefore, option D is correct.

Which two statements correctly describe RSTP port roles? (Choose two.)

Correct Answer:AD
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree1.
Option A suggests that the designated port forwards data to the downstream network segment or device. This is correct because the designated port is the port on a network segment that has the best path to the root bridge1. It??s responsible for forwarding frames towards the root bridge and sending configuration messages into its segment1.
Option D suggests that the root port is responsible for forwarding data to the root
bridge. This is also correct because the root port is always the link directly connected to the root bridge, or the shortest path to the root bridge1. It??s used to forward traffic towards the root bridge1.
Therefore, options A and D are correct.