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Juniper JN0-351 Exam Syllabus Topics:

Section	Objectives
Protocol Independent Routing	- Static routes, aggregate routes - Configuration, monitoring and troubleshooting - Routing tables, routing preferences - Routing policy and firewall filters
Tunnels	- IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting
OSPF	- OSPFv2/v3 concepts, areas, LSA types - Neighbor relationships, route calculation - Configuration, monitoring and troubleshooting
Layer 2 Switching and VLANs	- Inter-VLAN routing - Configuration, monitoring and troubleshooting - Layer 2 switching concepts and operation - VLAN concepts, tagging, ports, native VLAN
High Availability	- Virtual Chassis, redundant routing engines - Graceful restart, nonstop active routing - Configuration, monitoring and troubleshooting
Spanning Tree Protocol	- STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting - Root bridge, port roles and states
IS-IS	- Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information
Layer 2 Security	- Configuration, monitoring and troubleshooting - Layer 2 firewall filters - Port security, storm control, MAC limiting - Dynamic ARP inspection, DHCP snooping
BGP	- BGP concepts, attributes, path selection - IBGP, EBGP, route policies - Configuration, monitoring and troubleshooting

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q153-Q158):

NEW QUESTION # 153
Which two statements are correct about behavior aggregate (BA) classifiers in Junos OS CoS?
(Choose two.)

A. BA classifiers can only be used for egress traffic shaping.
B. A BA classifier assigns forwarding class and loss priority based on a field in the packet header, such as DSCP or IEEE 802.1p.
C. A BA classifier examines multiple fields, including source and destination address, similar to a multifield classifier.
D. BA classifiers are applied on ingress interfaces.

Answer: B,D

Explanation:
A behavior aggregate (BA) classifier assigns a forwarding class and loss priority to incoming packets based on a single field in the packet header, such as the DSCP value in IP packets or the IEEE 802.1p CoS bits in Ethernet frames. BA classifiers are applied on ingress interfaces to determine how a packet will be treated as it moves through the device.

NEW QUESTION # 154
Referring to the exhibit, which statement is correct?

A. The local device is the root bridge for this RSTP topology.
B. The root bridge has not been elected for this RSTP topology.
C. The root bridge is using a bridge priority of 4k.
D. The local device is using a bridge priority of 4k.

Answer: C

Explanation:
The "Root ID" shows 4096.00:19:e2:55:36:1e. The first part of this ID, 4096, is the bridge priority of the root bridge.
The local bridge ID is shown as 32768.00:19:e2:55:1d:30, indicating that the local device has a default bridge priority of 32768, which is higher (and thus less preferred) than 4096.
Thus, the root bridge has a priority of 4096, and the local device is not the root bridge. The local device is participating in the RSTP topology and has identified another bridge as the root.

NEW QUESTION # 155
Exhibit

You are a network operator troubleshooting BGP connectivity.
Which two statements are correct about the output shown in the exhibit? (Choose two.)

A. The BGP session is not established.
B. The R1 is configured for AS 65400.
C. Peer 10.32.1.2 is configured for AS 63645.
D. The routers are exchanging IPv4 routes.

Answer: A,B

Explanation:
Explanation
Option B suggests that the BGP session is not established. This is correct because in the output, the state of the BGP session is shown as "Idle". In BGP, an "Idle" state means that the BGP session is not currently established1.
Option C suggests that R1 is configured for AS 65400. This is also correct because in the output, it's shown that the local AS number is 654001. The local AS number represents the Autonomous System (AS) number of the router on which you're checking the BGP session1.

NEW QUESTION # 156
Which two types of tunnels are able to be created on all Junos devices? (Choose two.)

A. IP-IP
B. GRE
C. IPsec
D. STP

Answer: B,C

Explanation:
Junos devices support various types of tunnels for different purposes 1 2 .
* Option B is correct. Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network 1 . Junos devices support GRE tunnels 1 .
* Option D is correct. IPsec (Internet Protocol Security) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session 1
. Junos devices support IPsec tunnels 1 .
* Option A is incorrect. Spanning Tree Protocol (STP) is not a type of tunnel. It's a network protocol designed to prevent loops in a bridged Ethernet local area network 2 .
* Option C is incorrect. While Junos devices do support IP-IP (also known as IP tunneling), it's not supported on all Junos devices 1 .

NEW QUESTION # 157
Which statement is correct regarding the use of the Junos OS "export" policy applied to a routing protocol?

A. An export policy controls which routes are accepted into the routing table from a neighbor.
B. An export policy controls which routes from the routing table are advertised to a neighbor or redistributed into another protocol.
C. Export policies have no effect on BGP.
D. Export policies can only be applied to static routes.

Answer: B

Explanation:
An export policy in Junos OS is applied to control which routes from the local routing table are advertised outward to a neighboring router or redistributed from one protocol into another (for example, redistributing static routes into OSPF). This is in contrast to an import policy, which filters or modifies routes being received from a neighbor before they are installed into the routing table.

NEW QUESTION # 158
......

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