https://www.omnisecu.com/tcpip/ipv6/comparison-between-ipv4-header-and-ipv6-header.php#:~:text=IPv6%20header%20is%20much%20simpler%20than%20IPv4%20header. & text=The%20size%20of%20IPv6%20header,are%20128%20bit%20binary%20numbers. & text=In%20IPv4%20header%2C%20the%20source,are%2032%20bit%20binary%20numbers .

The flow label is a new field added to IPv6 headers that was not present in IPv4 headers. It is used to identify packets that require special handling by routers, particularly for quality-of-service (QoS) purposes.

Filter-based forwarding in Junos requires the creation of a routing policy to specify the match conditions and actions and the application of a match filter to classify traffic to use the policy.

In IS-IS, Level 1 routes are usually contained within the same area and Level 2 routes are used to interconnect different areas. By default, routes from Level 1 are redistributed into Level 2, and vice versa, to ensure reachability between areas.

References

Juniper Networks Technical Documentation on IS-IS

By default, IS-IS protocol leaks routing information from a Level 1 area to a Level 2 area. However, to leak routing information from a Level 2 area to a Level 1 area, an export policy must be explicitly configured.

When establishing an EBGP session, it ' s necessary to specify both the local AS number and the local address that the session will use. The local address is required for establishing the TCP connection for BGP. The local AS must be specified to identify the autonomous system of the router.

BGP selects the active route based on an ordered list of attributes. The correct order is:

Weight (Cisco proprietary, not listed in the options)

Local Preference

Network (route) originated from the BGP router itself

Shortest AS Path

Lowest Origin Type

Lowest MED

eBGP over iBGP paths

Closest IGP Neighbor

Lowest Router ID

The next hop is checked for reachability but is not part of the BGP decision process for selecting the best path.

References

Juniper Networks Technical Documentation on BGP