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| Section | Objectives |
|---|---|
| Spanning Tree Protocol | - Convergence issues identification - Port roles interpretation - Loop prevention and redundancy - STP topology design and troubleshooting - Bridge priority and port cost optimization |
| Layer 2 Switching or VLANs | - VLAN concepts and functionalities - Inter-VLAN routing - Frame processing - Native VLANs and voice VLANs - Bridging components - Ports and tagging - Configuration, monitoring, and troubleshooting |
| Layer 2 Security | - DHCP snooping - Dynamic ARP inspection - Common Layer 2 attack mitigation - Port security implementation |
| Protocol Independent Routing | - Routing fundamentals |
| IS-IS | - IS-IS configuration and troubleshooting |
| OSPF | - OSPF configuration and troubleshooting |
| BGP | - BGP configuration and troubleshooting |
| High Availability | - VRRP and redundancy protocols - High availability design and integration |
| Tunnels | - Tunnel technologies |
The Juniper JN0-351 Certification is one of the most valuable certificates in the modern Juniper world. This Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) certification exam is designed to validate a candidate's skills and knowledge level. With this JN0-351 exam everyone whether he is a beginner or seasoned professional can not only validate their expertise but also get solid proof of their skills and knowledge. By doing this you can gain several personal and professional benefits.
NEW QUESTION # 90
Which statement is correct about IP-IP tunnels?
Answer: A
Explanation:
Explanation
IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels only support encapsulating IP traffic, which means that the payload of the inner packet must be an IP packet. IP-IP tunnels cannot encapsulate non-IP traffic, such as Ethernet frames or MPLS labels1.
Option A is correct, because IP-IP tunnels only support encapsulating IP traffic. Option B is incorrect, because IP-IP tunnels only support encapsulating non-IP traffic. Option C is incorrect, because the TTL in the inner packet is not decremented during transit to the tunnel endpoint. The TTL in the outer packet is decremented by each router along the path, but the TTL in the inner packet is preserved until it reaches the tunnel endpoint2.
Option D is incorrect, because there are 20 bytes of overhead with IP-IP encapsulation. The overhead consists of the header of the outer packet, which has a fixed size of 20 bytes for IPv43.
References:
1: IP-IP Tunneling 2: What is tunneling? | Tunneling in networking 3: IPv4 - Header
NEW QUESTION # 91
Exhibit
Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device Which BGP attribute would you use?
Answer: A
Explanation:
Explanation
The BGP attribute that you would use to forward all Internet traffic through the R1 device is the local preference1.
The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers1. It is used to select an exit point from the AS1. The path with the highest local preference is preferred1. By setting a higher local preference for the routes received from R1, you can make R1 the preferred exit point for all Internet traffic1.
NEW QUESTION # 92
Which two types of tunnels are able to be created on all Junos devices? (Choose two.)
Answer: A,D
Explanation:
GRE tunnels can be created on all Junos devices. GRE is a tunneling protocol that encapsulates a wide variety of network layer protocols inside virtual point-to-point links.
IP-IP tunnels can also be created on all Junos devices. IP-IP tunneling is used to encapsulate IP packets within IP packets, providing a simple way to tunnel IP traffic.
NEW QUESTION # 93
Which two statements are correct about Junos OS Nonstop Active Routing (NSR)? (Choose two.)
Answer: B,D
Explanation:
Nonstop Active Routing (NSR) synchronizes routing protocol state information, such as OSPF and BGP adjacencies, between the master and backup Routing Engines in real time. This allows a switchover between Routing Engines to occur transparently, without requiring cooperation or awareness from neighboring routers, unlike graceful restart which does require neighbor support.
NEW QUESTION # 94
Which statement is correct about Junos OS class of service (CoS) forwarding classes?
Answer: C
Explanation:
In Junos OS class of service, a forwarding class is used to group packets for output queuing and scheduling treatment on egress interfaces. Packets are typically assigned to a forwarding class based on a classifier that examines fields such as DSCP or IEEE 802.1p CoS bits, and each forwarding class is then mapped to a specific output queue with defined scheduling behavior.
NEW QUESTION # 95
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