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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
You are asked to create connections between routing instances on the same Junos device and route between the connected Instances. What are two ways to accomplish this task? (Choose two.)
To create connections between routing instances on the same Junos device and route between them, you can use logical tunnel interfaces, which are virtual interfaces that can be used to route traffic between instances without the need for physical connectivity. Additionally, loopback interfaces, which represent the device itself, can be used to route traffic between routing instances as they are always up and can be reached within the device.
Juniper Networks Technical Documentation on Routing Instances
Juniper Networks Technical Documentation on Logical Tunnel Interfaces
Which two statements ate correct about the community BGP attribute on a Junos device? (Choose two.)
The community attribute in BGP is an optional transitive attribute. It is not mandatory for BGP operations, but when it is present, it should be passed unchanged to other BGP peers unless explicitly modified by a routing policy. The community attribute is used to group destinations in a certain way, often to apply routing policies to those destinations collectively.
Juniper Networks documentation on BGP communities: BGP Communities Overview
Click the Exhibit button.
Referring to the exhibit, from which device(s) does R3 learn about Route X?
R2 can not forward IBGP learned routes to another IBGP neighbor correct
R3 will learn about Route X from R2 only. R1 is in a separate AS and Route X is advertised to R2 through eBGP. R2 will then advertise the route to R3 using iBGP. R3 cannot learn routes directly from another AS without having a direct eBGP session with that AS. Reference::
BGP Route Propagation and Selection, Juniper Networks Documentation
Understanding iBGP and eBGP Route Distribution, Juniper Networks Documentation
The segment touting SRGB start label Is 10,000 and the SRGB index range is 500.
In this scenario, which two statements are correct? (Choose two.)
The Segment Routing Global Block (SRGB) defines a range of MPLS labels reserved for segment routing. With an SRGB starting label of 10,000 and an index range of 500, the first usable label is indeed 10,001 because label 10,000 is typically reserved and not used for forwarding. The last usable label would be 10,499 because the range includes 500 labels starting from 10,001.
Juniper Networks documentation on Segment Routing: Segment Routing Overview
