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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Enterprise Routing and Switching, Specialist (JNCIS-ENT) |
| Exam Number: | JN0-351 |
| Exam Format: | Multiple-choice questions |
| Related Certifications: | JNCIS-ENT |
| Real Exam Qty: | 65 |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Exam Price: | $300 USD |
| Passing Score: | Not specified (Pass/Fail status available immediately) |
| Certificate Validity Period: | 3 years |
| Sample Questions: | Juniper JN0-351 Sample Questions |
| Exam Way: | Pearson VUE testing centers (In-person) |
| Pre Condition: | Recommended: JNCIA-Junos certification |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html |
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質問 # 158
You enable persistent MAC learning on your Juniper switch. In this scenario, which statement is correct?
正解：D
質問 # 159
Which two types of tunnels are able to be created on all Junos devices? (Choose two.)
正解：B、C
解説：
Explanation
Junos devices support various types of tunnels for different purposes12.
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 network1. Junos devices support GRE tunnels1.
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 session1. Junos devices support IPsec tunnels1.
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 network2.
Option C is incorrect. While Junos devices do support IP-IP (also known as IP tunneling), it's not supported on all Junos devices1.
質問 # 160
Referring to the exhibit, which two statements about BGP prefixes advertised by R1 to AS 65501 are true? (Choose two.)
正解：A、C
質問 # 161
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)
正解：B、D
解説：
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies. If the MTU is less than this, IS-IS adjacencies will not be established.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established.
質問 # 162
Referring to the exhibit, which three statements are correct? (Choose three.)
正解：A、D、E
解説：
According to the Juniper documentation 1 , the output of the show vlans command displays the forwarding options for the VLAN, including the DHCP security features. In the exhibit, the output shows that DHCP security is enabled, and that ARP inspection and IP source guard are also enabled. These features work together to protect the switch from IP spoofing and ARP spoofing attacks. DHCP snooping builds a database of IP/MAC bindings by snooping DHCP messages. ARP inspection validates ARP packets against the DHCP snooping database and drops invalid packets. IP source guard checks the IP and MAC source addresses of packets against the DHCP snooping database and drops spoofed packets 2 3 . Therefore, the correct answer is A, B, and C.
The other options are not correct because:
* D. The DHCP snooping database is not protected by default. To protect the database from corruption or loss, you need to configure a file name and a location for storing the database, and enable periodic write operations to the file 4 . The exhibit does not show any such configuration.
* E. DHCP snooping is not enabled for IPv6 traffic by default. To enable DHCPv6 snooping, you need to configure a DHCPv6 relay agent and specify the trusted interfaces for DHCPv6 messages 5 . The exhibit does not show any such configuration.
References: show vlans | Junos OS , Understanding and Using DHCP Snooping | Junos OS , Understanding and Using Dynamic ARP Inspection (DAI) | Junos OS , Protecting the DHCP Snooping Database | Junos OS
, Understanding and Using DHCPv6 Snooping | Junos OS
質問 # 163
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