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Juniper JN0-650 Exam Syllabus Topics:

Topic	Details
Topic 1	Layer 2 Authentication and Access Control: This domain examines network access control mechanisms including 802.1x, MAC RADIUS, captive portal, server fail fallback, guest VLANs, and multi-method authentication considerations.
Topic 2	IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP LLDP-MED protocols, and voice VLAN implementation.
Topic 3	Ethernet Switching and Spanning Tree: This section covers advanced Layer 2 switching including filter-based VLANs, private VLANs, MVRP, Layer 2 tunneling via Q-in-Q and L2PT, plus MSTP and VSTP protocols.
Topic 4	BGP: This section focuses on Border Gateway Protocol operations including route selection, next hop resolution, BGP attributes, communities, load balancing, IPv4 IPv6 address families, advanced options, and routing policy implementation.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q86-Q91):

NEW QUESTION # 86
Referring to the exhibit:

You want to provide Layer 2 connectivity between campus sites using Ethernet switches through a metro Ethernet service provider who is using Q-in-Q tagging on their network. What are two design considerations in this environment? (Choose two.)

A. Each campus switch shown must have S-Tag 300 configured.
B. VXLAN could be implemented on your network across this service provider network.
C. L2PT is required on the SP network to support the spanning tree protocol.
D. Each campus switch shown must have a C-Tag 300 configured.

Answer: A,C

NEW QUESTION # 87
Which statement accurately describes the operation of OSPF within the Junos OS?

A. OSPF is used for routing information and neighbor discovery within a single autonomous system (AS).
B. OSPF does not automatically advertise directly connected routes.
C. OSPF is used for routing information and neighbor discovery between multiple autonomous systems.
D. OSPF calculates routes using a distance vector algorithm.

Answer: A

Explanation:
In Junos OS, OSPF is an interior gateway protocol used within a single autonomous system (AS) to exchange routing information and perform neighbor discovery. It uses a link-state algorithm, not a distance-vector algorithm.

NEW QUESTION # 88
Exhibit:
Mar 16 19:12:58.291474 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179
Mar 16 19:12:58.291624 BGP RECV message type 1 (Open) length 59
Mar 16 19:12:58.291688 BGP RECV version 4 as 2 holdtime 90 id 192.168.2.1 parmlen 30 Mar 16 19:12:58.291752 BGP RECV MP capability AFI=1, SAFI=1 Mar 16 19:12:58.291802 BGP RECV Refresh capability, code=128 Mar 16 19:12:58.291850 BGP RECV Refresh capability, code=2 Mar 16 19:12:58.291915 BGP RECV Restart capability, code=64, time=120, flags= Mar 16 19:12:58.291969 BGP RECV 4 Byte AS-Path capability (65), as_num 2 Mar 16 19:12:58.292385 advertising receiving-speaker only capabilty to neighbor 172.14.10.2 (External AS 2) Mar 16 19:12:58.292452 bgp_senD. sending 59 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.292522 Mar 16 19:12:58.292522 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.292601 BGP SEND message type 1 (Open) length 59 Mar 16 19:12:58.293053 BGP SEND version 4 as 1 holdtime 90 id 192.168.2.1 parmlen 30 Mar 16 19:12:58.293124 BGP SEND MP capability AFI=1, SAFI=1 Mar 16 19:12:58.293173 BGP SEND Refresh capability, code=128 Mar 16 19:12:58.293221 BGP SEND Refresh capability, code=2 Mar 16 19:12:58.293284 BGP SEND Restart capability, code=64, time=120, flags= Mar 16 19:12:58.293336 BGP SEND 4 Byte AS-Path capability (65), as_num 1 Mar 16 19:12:58.293517 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.293573 Mar 16 19:12:58.293573 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.293665 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:12:58.296781 Mar 16 19:12:58.296781 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 1619:12:58.296897 BGP RECV messaae tvoe 4 (KeeDAlivel lenath 19 Mar 16 19:12:58.297451 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.297528 Mar 16 19:12:58.297528 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.297600 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:12:58.298102 bgp_senD. sending 23 bytes to 172.14.10.2 (External AS 2) Mar 16 19:12:58.298185 Mar 16 19:12:58.298185 BGP SEND 172.14A0.1+179 -> 172.14.10.2+51230 Mar 16 19:12:58.298273 BGP SEND message type 2 (Update) length 23 Mar 16 19:12:58.298322 BGP SEND End of RIB. AFI 1 SAFI 1 Mar 16 19:12:58.301834 Mar 16 19:12:58.301834 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:12:58.301957 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:12:58.302034 bgp_read v4_messagE. done with 172.14.10.2 (External AS 2) received 19 octets 0 updates 0 routes Mar 16 19:12:58.304594 Mar 16 19:12:58.304594 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:12:58.304702 BGP RECV message type 2 (Update) length 23 Mar 16 19:12:58.304765 BGP RECV End of RIB. AFI 1 SAFI 1 Mar 16 19:12:58.304848 bgp_read v4_messagE. done with 172.14.10.2 (External AS 2) received 23 octets 1 update 0 routes Mar 16 19:13:22.968415 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:13:22.968586 Mar 16 19:13:22.968586 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:13:22.968675 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:13:26.901339 Mar 16 19:13:26.901339 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:13:26.901464 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:13:26.901543 bgp_read v4_messagE. done with 172.14.10.2 (External AS 2) received 19 octets 0 updates 0 routes Mar 16 19:13:51.335927 bgp_senD. sending 19 bytes to 172.14.10.2 (External AS 2) Mar 16 19:13:51.348180 Mar 16 19:13:51.348180 BGP SEND 172.14.10.1+179 -> 172.14.10.2+51230 Mar 16 19:13:51.348296 BGP SEND message type 4 (KeepAlive) length 19 Mar 16 19:13:53.844160 Mar 16 19:13:53.844160 BGP RECV 172.14.10.2+51230 -> 172.14.10.1+179 Mar 16 19:13:53.844329 BGP RECV message type 4 (KeepAlive) length 19 Mar 16 19:13:53.844392 bgp_read_v4_messagE. done with 172.14.10.2 (External AS 2) received 19 octets 0 updates 0 routes Looking at the trace options output, what is the current keepalive timer set for in BGP?

A. 1 second
B. 90 seconds
C. 10 seconds
D. 30 seconds

Answer: D

NEW QUESTION # 89
What are two characteristics of a trunk port on a Juniper switch? (Choose two.)

A. typically carry tagged traffic
B. typically connect to end user devices
C. typically connect to other switches or routers
D. typically associated with a single VLAN

Answer: A,C

NEW QUESTION # 90
Your OSPF network consists of a mix of 1GbE and 10GbE interfaces. By default, all interfaces have the same cost in your OSPF network. You are asked to ensure that the 10GbE interfaces are more preferred when available In this scenario, which two statements would accomplish this behavior? (Choose two.)

A. You should define the reference bandwidth as 10G. which will assign the 1GbE interfaces a higher cost
B. You should manually assign the interface metric for each 10GbE interface to be higher than the 1GbE interfaces in your OSPF network.
C. You should define the reference bandwidth as 1G. which will assign the 1GbE interfaces a higher cost.
D. You should manually assign the interface metric for each 1GbE interface to be higher than the 10GbE interfaces in your OSPF network.

Answer: A,D

Explanation:
OSPF determines the best path to a destination by calculating the metric (cost) of each link. By default, Junos OS uses a reference bandwidth of 100 Mbps to calculate this cost using the formula:

When the reference bandwidth is left at the default 100 Mbps, any interface with a speed of 100 Mbps or higher (including 1 GbE and 10 GbE) is assigned a cost of 1 because the minimum OSPF cost is 1. This results in equal-cost paths, preventing the router from preferring the faster 10 GbE link.
To ensure 10 GbE interfaces are preferred, you must create a cost differential:
* Option A (Reference Bandwidth): By increasing the reference bandwidth to 10G (or higher), the calculation changes. For a 10 GbE link, the cost becomes $10,000 / 10,000 = 1$. For a 1 GbE link, the cost becomes $10,000 / 1,000 = 10$. Since OSPF prefers the path with the lowest cumulative cost, the
10 GbE link is now preferred.
* Option D (Manual Metric): You can manually override the automatic cost calculation by assigning a higher metric specifically to the 1 GbE interfaces. If a 1 GbE interface is manually set to a cost of 50 and the 10 GbE interface remains at 1 (or is set to a lower value), the router will prioritize the 10 GbE path.
Option B is incorrect because a higher metric makes a path less preferred. Option C is incorrect because a
1G reference bandwidth would still result in both 1 GbE and 10 GbE interfaces having a cost of 1.

NEW QUESTION # 91
......

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