The FE80::/10 prefix is reserved for IPv6 link-local addresses. These addresses are auto-configured on

all IPv6-enabled interfaces and can be used for communication within the local link (subnet) only.

Reference:

Juniper Networks Technical Documentation on IPv6 Addressing

To prevent a router from participating in the OSPF designated router (DR) and backup designated

router (BDR) election process, you set the OSPF priority to 0 on the interfaces of that router. This tells

OSPF that the router on those interfaces is not to be considered for election as either DR or BDR,

effectively making them DRother routers. The exhibit indicates that this is the desired configuration,

and therefore the correct command to issue on the Juniper device would be to set the priority to 0

on the relevant interfaces.

By default, BGP will propagate routes learned from EBGP peers to other IBGP peers. However, due to

the BGP split-horizon rule, routes learned from one IBGP peer are not re-advertised to another IBGP

peer. This behavior is designed to prevent routing information loops within the same AS.

Reference::

Juniper Networks documentation on BGP: BGP Route Propagation and Selection

The exhibit shows the show vrrp summary output from two routers, with both routers listing the

state of their VRRP group as master. VRRP allows for multiple routers to share a virtual IP address and

a virtual MAC address, but usually, only one router is the master at any given time while others are in

backup state. However, in some configurations, VRRP can operate in an active/active mode where

multiple routers handle traffic simultaneously for load sharing. Since both routers show the state as

master and there is no evidence of misconfiguration in the virtual IP addresses or priority, it indicates

that VRRP is likely functioning in an active/active setup.

Reference::

Juniper documentation on VRRP: Junos OS VRRP Overview

IS-IS is a link-state routing protocol that uses a Shortest Path First (SPF) algorithm to create a

topology map of the network. It floods link-state advertisements (LSAs) to all nodes within the

network area to ensure each node has a consistent view of the network topology.

Reference:

Juniper Networks Technical Documentation on IS-IS

Understanding IS-IS - Juniper Networks