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Which two statements are correct about segment routing? (Choose two.)
Segment routing is a source routing paradigm that allows a source router to define the path that a packet will take through the network by assigning an ordered list of segments---identifiers that specify a forwarding path for the packet through the network. Segment Routing can be implemented over an MPLS architecture or with IPv6 (SRv6).
A . Segment routing does not require a full mesh of adjacencies or state per transit path in the network, which is often the case with conventional MPLS signaling protocols like RSVP-TE. It leverages the existing IGP topology for forwarding without the need to maintain a state for each LSP (Label Switched Path), hence requiring very little resources to maintain.
B . In segment routing, labels (or segments) are distributed via IGP routing protocols like OSPF or IS-IS with extensions to carry segment routing information. These protocols are enhanced with Segment Routing extensions to distribute labels. For example, OSPFv2 is extended with Segment Routing extensions defined in RFC 8665.
C . This statement is not entirely correct. While it is true that segment routing does not require the maintenance of a state for each path (LSP), the concept of 'segment routing adjacencies' is a mischaracterization. Segment routing leverages the existing adjacencies formed by the underlying IGP.
D . Label assignments in segment routing are not advertised through LDP (Label Distribution Protocol) updates. Segment routing does away with LDP and instead uses IGP extensions to distribute labels.
Juniper Networks documentation on Segment Routing: Segment Routing Overview
Juniper Networks technical documentation providing guidance on configuring OSPF with Segment Routing extensions.
IETF RFC 8665: OSPF Extension for Segment Routing.
How does a Junos device learn about MAC addresses when II is first connected to an Ethernet LAN?
Junos devices learn about MAC addresses by examining the source MAC address of frames received on an interface and then storing these MAC addresses in the MAC address table (also known as the forwarding database) along with the interface on which the traffic was received. Reference::
Understanding Learning and Forwarding, Juniper TechLibrary
MAC Address Table Processing, Juniper TechLibrary
Which two statements are correct about the way that BGP propagates routes by default? (Choose two.)
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.
Juniper Networks documentation on BGP: BGP Route Propagation and Selection
Exhibit
You want the R1 and R3 routers to forward traffic destined to the 203.0.113.0/24 network through R2. Which BGP attribute would you modify to satisfy this requirement?
To influence the path taken through an autonomous system, the Multi-Exit Discriminator (MED) attribute can be used. By setting a lower MED on R2 for routes advertised to R1 and R3, it will make the path through R2 to the 203.0.113.0/24 network more preferable. Reference::
Understanding BGP Path Selection, Juniper TechLibrary
BGP Attributes and Path Selection, Juniper TechLibrary
You have created a routing instance named vr3 that will provide access to Server 2 (10.0.0.2) (or the hosts on the 10.10.10.0/24 network. Which command would you use to test connectivity between vr3 and Server 2?
To test connectivity to a server from within a specific routing instance, you use the ping command along with the routing-instance option to specify the routing instance from which you are pinging. This is necessary because the routing table associated with vr3 is separate from the main routing table, and you must explicitly tell the device to use the vr3 routing table to reach the server.
Juniper Networks documentation on Routing Instances: Routing Instances Overview
