You need to ensure that an iBGP-learned route is properly advertised to other eBGP peers without triggering routing loops. Which mechanism does BGP use automatically to prevent routing loops within an Autonomous System?
An MX Series router is configured with BGP Multipath. Two paths have identical Local Preference, AS path length, origin, and MED. Which additional configuration statement is required under protocols bgp to enable multipath load balancing across these iBGP paths?
A network engineer configures BGP confederations to scale an enterprise network. Which BGP path attribute is stripped or modified when an update leaves a sub-AS within the confederation and enters another sub-AS?
A Junos router receives four identical routes via BGP. Reviewing the routing table, path selection picked route 3. Route 1 has a lower MED, Route 2 has a higher Local Preference, Route 4 is from an eBGP peer while Route 3 is iBGP. Assuming standard default path selection, why was Route 3 chosen over Route 4?
An administrator is configuring eBGP between two Junos devices and notices the session is stuck in the Active state. The direct connection is up, and ping succeeds. Which Junos configuration parameter is most likely missing to resolve this issue?
A network operator needs to peer two routers in different Autonomous Systems that are not directly connected. Security policy mandates that TTL security checks be bypassed. Which command satisfies this requirement for the BGP session?
You are troubleshooting a route leak between two eBGP peers. You notice that an incoming route contains your own ASN in the AS_PATH attribute, yet the route was installed. Which Junos feature allowed this behavior, and where is it configured?
You configure a BGP route reflector in your iBGP topology. Which parameter must be configured on the route reflector client to prevent routing loops caused by reflecting routes?
An enterprise network uses BGP communities to tag routes for regional filtering. A router receives routes with community 65001:100. You need an export policy to match this community. How is the community defined in Junos configuration?
When a Junos router establishes an eBGP session, what is the default value of the Local Preference attribute assigned to incoming routes if not modified by a policy?
You need to configure an explicit export policy in Junos so that your eBGP router only advertises locally originated routes and refuses to transit third-party routes. Which AS_PATH regular expression accomplishes this?
An operator troubleshooting BGP path selection notices two routes have identical Local Preference, AS path length, origin, MED, and both are eBGP routes. Which attribute does the BGP path selection algorithm evaluate next?
An administrator implements an inbound policy to discard BGP routes matching a specific community. Which action statement is required in the policy term?
You notice that an iBGP peer is not advertising routes it learned from an eBGP peer to other iBGP peers. What architectural rule explains this behavior?
An enterprise customer connects to two different service providers via eBGP. They want to preferentially use Service Provider A, but fail over to Service Provider B if Provider A fails. How can they influence the inbound traffic from the providers?
An engineer configures a BGP policy to set the MED attribute on routes advertised to an eBGP peer. What is the primary purpose of the MED (Multi-Exit Discriminator) attribute?
When evaluating the BGP path selection algorithm on a Junos device, which THREE attributes are evaluated BEFORE the router considers the IGP metric to the BGP next hop? (Choose three)
An administrator is troubleshooting a BGP peering session that is stuck in the Connect or Active state. Which THREE common causes could explain this issue? (Choose three)
When troubleshooting a BGP routing loop or unexpected route suppression, which THREE Junos operational commands provide visibility into BGP path attributes and decision processes? (Choose three)
An administrator configures BGP multipath on a Junos router. Which THREE conditions must be met for BGP paths to be considered equal and installed as multipaths? (Choose three)
A network engineer configures an eBGP session on a Junos device and notices that routes learned from the external peer are not being installed in the routing table or advertised to other peers. What is the default behavior regarding eBGP route propagation and next-hop resolution on Junos OS?
An engineer configures iBGP peering between two routers in the same AS. Route reflection is not used. The engineer notices that routes learned from an eBGP peer by Router A are not being advertised by Router A to Router B (its iBGP peer). Why is this happening?
During BGP path selection on a Junos device, two paths are received for the same destination prefix. Path A has a MED of 50 received from a peer in AS 65001, and Path B has a MED of 10. Both AS paths have a length of 2. The router is not configured with 'always-compare-med'. Which path will be preferred by default?
You are the network engineer for a retail company running Juniper MX Series routers. R1 in AS 65001 peers with an ISP router R2 in AS 65002. The eBGP session is established, and R1 receives a route to 203.0.113.0/24 with AS path "65002 65003 65004". R1's BGP configuration includes 'peer 198.51.100.2 as-number 65002' and 'local-as 65010' under the group. What AS path will R1 advertise to its iBGP peer R3 for this route?
A Juniper router is configured with BGP and receives multiple paths to the same destination. The router is configured with the multipath multiple-as statement. Two paths are from different autonomous systems and have identical local preference, AS path length, origin, and MED. However, the router only installs one path in the forwarding table. What is the reason for this behavior?
You are configuring BGP on a Juniper router and want to ensure that the router prefers routes learned from a specific eBGP peer. Which BGP attribute should you manipulate, and how, to achieve this?
An administrator wants to modify the Local Preference attribute for all routes received from a specific external BGP peer. Where must this policy be applied in Junos?
During troubleshooting of a flapping BGP session, you notice BGP Notification messages being sent. Which BGP message type is responsible for tearing down a session due to an error condition?
An engineer must inspect the BGP state and verify the received prefix counts from a specific neighbor on an MX Series router. Which operational command should be used?
While reviewing BGP updates, you notice an attribute type code of 3 with a value representing an IP address. Which well-known mandatory path attribute is this?
An administrator configures a BGP policy to reject routes with an AS_PATH containing a specific AS number. Which match condition in a Junos routing policy is used to evaluate the AS_PATH?
A BGP speaker receives an UPDATE message containing a malformed attribute. According to BGP specifications, which action does the receiving router take?
You need to configure authentication for a BGP peering session on a Junos device to prevent spoofing attacks. Where is the MD5 authentication key configured?
You are running BGP between two routers. One router has a 4-byte ASN (e.g., ASN 65536). The remote router only supports 2-byte ASNs. How does BGP handle this compatibility issue?
While examining a BGP routing table, you notice a route with an ORIGIN attribute set to 'Incomplete'. What does this indicate about the origin of the route?
An administrator wants to gracefully restart a BGP routing daemon without dropping the underlying TCP session or causing traffic loss. Which Junos feature should be enabled?
You need to ensure that BGP sessions fail over within sub-second intervals if a link degrades or goes down. Which protocol should you integrate with BGP on your Junos router?
A Junos router is configured as a BGP route reflector. It learns a route from a client and reflects it to a non-client and another client. Which attribute does the route reflector modify or add to prevent routing loops?
An engineer is troubleshooting a BGP session between two routers and notices that the connection is stuck in the Active state. What does the Active state indicate about the BGP finite state machine?
Which BGP message type is responsible for negotiating session parameters, including autonomous system numbers, hold times, and BGP identifiers during session establishment?
A network administrator needs to modify the Local Preference path attribute for all routes received from a specific external BGP peer using a routing policy on Junos. Under which configuration hierarchy should the routing policy be applied?
You are configuring a new eBGP session between two Juniper routers in different autonomous systems. The physical link is up and you can ping the remote interface, but the BGP session remains in the Active state. Reviewing the configuration, you notice that the neighbor statement on both routers specifies the loopback address of the peer, but no additional configuration is present. What is the most likely cause of the problem?
You are configuring BGP on a Juniper SRX Series firewall. You want to influence inbound traffic from an eBGP peer for a specific prefix. You have applied an export policy that prepends your AS multiple times. Which two statements are true about AS path prepending in this scenario? (Choose two.)
You are a network administrator for a company using Juniper EX Series switches. You have an iBGP session between two routers in the same AS. You notice that routes learned from one iBGP peer are not being advertised to another iBGP peer. What is the default behavior of iBGP that explains this?
You are configuring a BGP session between two Juniper routers. You want to ensure that the session can be established and that routes are exchanged correctly. Which two statements are true about BGP message types? (Choose two.)
A Juniper router is configured with a BGP peer group that includes multiple neighbors. You want to apply a policy to all neighbors in the group that sets the next-hop to a specific address for all routes received from them. Which configuration statement should you use?