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| Section | Objectives |
|---|---|
| Layer 2 Switching | - VLANs and trunking
|
| Tunneling Technologies | - IP tunneling
|
| Layer 3 Routing Fundamentals | - Routing concepts
|
| Layer 2 Security | - Switch security features
|
| High Availability | - Redundancy mechanisms
|
Applicants of the JN0-351 test who invest the time, effort, and preparation with updated JN0-351 questions eventually get success. Without the latest Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) exam dumps, candidates fail the test and waste their time and money. As a result, preparing with actual JN0-351 Questions is essential to clear the test.
NEW QUESTION # 176
Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)
Answer: A,D
Explanation:
* Option B is correct. Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated 1 . This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast 1 .
* Option C is correct. Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received 2 3 . This information is stored in a MAC address table, also known as a bridge table 2 3 .
* Option A is incorrect. Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network 2 . It's not a mechanism used in building and maintaining a Layer 2 bridge table 2 .
* Option D is incorrect. Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state
2 . It's not a mechanism used in building and maintaining a Layer 2 bridge table 2 .
NEW QUESTION # 177
Which two statements are correct about tunnels? (Choose two.)
Answer: A,C
Explanation:
Explanation
A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly used to secure data communications between two networks or to connect two networks that use different protocols.
Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network. This means that they must have a valid route to the IP address of the remote endpoint1.
Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets. This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and trailer of the surrounding packet add extra bytes to the packet size, which is called overhead. Overhead can reduce the efficiency and performance of a network, as it consumes more bandwidth and processing power2.
Option A is incorrect, because BFD can be used to monitor tunnels. BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery.
BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.
Option C is incorrect, because IP-IP tunnels are stateless. 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 are stateless, which means that they do not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do not provide any error detection or recovery mechanisms.
References:
1: What is Tunneling? | Tunneling in Networking 2: What Is Tunnel In Networking, Its Types, And Its Benefits? : [Configuring Bidirectional Forwarding Detection] : [IP-IP Tunneling]
NEW QUESTION # 178
Click the Exhibit button.
You want to redistribute the static routes into BGP, but they do not show as BGP routes.
What causes this result to occur?
Answer: D
Explanation:
The static route to the 0.0.0.0/0 network has a next hop of xe-0/0/0.0, which is a local interface. BGP does not accept static routes with a local interface as the next hop, because it cannot advertise them to other BGP peers.
BGP requires a valid IP address as the next hop for static routes that are redistributed into BGP. To fix this issue, the static route should have a next hop of an IP address that is reachable via the xe-0/0/0.0 interface, such as the IP address of the eBGP neighbor. Alternatively, the next hop can be modified by using a route map when redistributing the static route into BGP12.
The other options are not correct because:
The as-path parameter is not required for redistributing static routes into BGP. The as-path attribute is automatically set by BGP when advertising routes to other BGP peers3.
A community string is not required for redistributing static routes into BGP. A community is an optional attribute that can be used to group routes and apply policies to them4.
The no-readvertise feature is not specified in the configuration. The no-readvertise feature is used to prevent routes learned from one iBGP peer from being advertised to another iBGP peer5.
References:
How to configure BGP to send the default route to a neighbor
Redistributing Static Route in to BGP - Cisco Community
BGP Fundamentals
BGP Communities Attribute
BGP No-Readvertise Feature
NEW QUESTION # 179
Which statement correctly describes the purpose of BPDU protection in Junos OS?
Answer: D
Explanation:
BPDU protection is applied to edge ports (ports expected to connect only to end hosts) to guard against unauthorized or rogue switches being connected. If a BPDU is received on a protected edge port, the port is automatically disabled, preventing potential spanning tree topology changes caused by unauthorized devices.
NEW QUESTION # 180
Two routers share the same highest priority and start time.
Answer: B
Explanation:
According to the OSPF protocol, the designated router (DR) is the router that acts as the focal point for exchanging routing information on a multi-access network segment, such as a LAN1. The DR election process is based on the following criteria, in order of precedence1:
The router with the highest OSPF priority becomes the DR. The default priority is 1, and a priority of 0 means the router will not participate in the election.
If there is a tie in priority, the router with the highest router ID becomes the DR. The router ID is a 32-bit number that uniquely identifies a router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address of a loopback interface or a physical interface.
If there is a tie in router ID, the router that was first to become an OSPF neighbor becomes the DR.
In your scenario, two routers share the same highest priority and start time. This means that they have equal chances of becoming the DR based on the first and third criteria. Therefore, the second criterion will be used to break the tie, which is the router ID. The router with the highest router ID will become the DR, and the other router will become the backup designated router (BDR), which is ready to take over the role of DR if it fails1.
NEW QUESTION # 181
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