JNCIP-ENT Practice Test 4 — 10 Questions

Question 1

A network administrator wants to advertise an aggregate BGP route while suppressing the more specific component routes from being sent to external peers. Which Junos routing-options configuration achieves this?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Configure the aggregate route with the 'summary-only' parameter under routing-options bgp.. Using the 'aggregate' statement with the 'summary-only' option generates the aggregate prefix and suppresses all component specific routes.

Answer

Enable BGP dampening on the aggregate route and disable it on the component routes.

Answer

Apply a routing policy that sets the NO_EXPORT community on all component routes.

Answer

Configure an aggregate route with the 'discard' policy and apply an export policy that drops component routes.

Question 2

You want to configure voice VLAN functionality on a Juniper EX switch so that IP phones automatically place voice traffic into VLAN 50 while passing PC data through unchanged. Which feature should you configure?

Accepted Answer

LLDP-MED with voice VLAN assignment. Voice VLAN feature on EX switches automatically assigns voice traffic from known MAC OUIs to the designated voice VLAN.

Answer

MAC-based RADIUS dynamic VLAN assignment

Answer

Layer 2 protocol tunneling (L2PT)

Answer

IEEE 802.1X supplicant authentication

Question 3

Which protocol version introduces explicit source inclusion and exclusion lists (TO_EX, TO_IN, IS_IN, IS_EX) in membership reports?

Accepted Answer

IGMPv3. IGMPv2 supports basic group membership, whereas IGMPv3 introduces source-filtering capabilities allowing hosts to specify include or exclude source lists.

Answer

IGMPv2

Answer

IGMPv4

Answer

IGMPv1

Question 4

You are configuring a BGP Route Reflector (RR) in a Junos environment. To prevent routing loops within the iBGP cluster, what mechanism does the route reflector use to track the path of reflected routes?

Accepted Answer

Cluster List and Originator ID attributes. Route reflectors use the 'Originator ID' (a 4-byte attribute containing the router ID of the route originator) and the 'Cluster List' (a sequence of cluster IDs through which the route has passed) to prevent routing loops.

Answer

MED comparison and router ID tie-breakers

Answer

AS Path prepending and local preference manipulation

Answer

TTL security decrement and loose reverse path forwarding

Question 5

Which command verifies the OSPF neighbor states and adjacency progress on a Junos device?

Accepted Answer

show ospf neighbor. The 'show ospf neighbor' command displays OSPF neighbor states, interface, and dead timer details.

Answer

show route table ospf.0 neighbor

Answer

show protocols ospf neighbors

Answer

show ospf adjacency

Question 6

When configuring a BGP confederation, how are external peers outside the confederation affected by the internal sub-AS structure?

Accepted Answer

They see only the top-level confederation AS number in the AS path attribute.. External peers outside the confederation see only the top-level confederation AS number, as internal member AS numbers are stripped when exiting the confederation boundary.

Answer

They require explicit configuration of every member AS in their own EBGP import filters.

Answer

They see all member AS numbers prepended individually in the AS path.

Answer

They reject all updates originating from a confederation due to AS path validation failures.

Question 7

An administrator configures BGP dampening on a Junos router to mitigate the impact of flapping routes. When a route exceeds the reuse threshold after being suppressed, what happens to its penalty value?

Accepted Answer

The penalty value continues to decay exponentially until it drops to zero.. When a dampened route's penalty decays below the reuse threshold, the route becomes eligible again, and its penalty continues to decay exponentially toward zero.

Answer

The penalty value is locked at the reuse threshold value indefinitely.

Answer

The penalty value is doubled to discourage further flapping.

Answer

The penalty value is instantly reset to zero.

Question 8

Which TWO actions can be performed by an OSPF routing policy export filter when redistributing routes into OSPF? (Choose two)

Accepted Answer

Modify the OSPF route metric using the metric action.. Routing policies when exporting into OSPF can set metric types (Type 1 or Type 2) and modify route metrics. They cannot directly change area ID during redistribution without area design changes.

Answer

Change the OSPF hello timer interval via routing policy.

Answer

Alter the OSPF router ID of neighboring routers.

Answer

Change the OSPF area ID of external routes dynamically.

Question 9

When configuring advanced Q-in-Q tunneling on Juniper MX Series routers, which THREE encapsulation or tagging parameters must be correctly aligned between the customer edge and provider edge interfaces? (Choose three)

Accepted Answer

VLAN action rules (pop, push, or swap). Q-in-Q alignment requires matching flexible-vlan-tagging, TPID values (EtherType), and VLAN tag preservation/manipulation rules.

Answer

MSTP region name configuration

Answer

IGMP snooping version compatibility

Question 10

Which EVPN route type is responsible for establishing ingress replication lists for Broadcast, Unknown Unicast, and Multicast (BUM) traffic?

Accepted Answer

Route Type 3. Route Type 3 (Inclusive Multicast Ethernet Tag Route) is used to build the peer list for BUM traffic distribution using ingress replication (head-end replication).

Answer

Route Type 5

Answer

Route Type 4

Answer

Route Type 1