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NEW QUESTION # 146
Which two statements are correct about tunnels? (Choose two.)
Answer: B,D
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 # 147
What is the default keepalive time for BGP?
Answer: C
Explanation:
Explanation
The default keepalive time for BGP is 60 seconds1. The keepalive time is the interval at which BGP sends keepalive messages to maintain the connection with its peer1. If the keepalive message is not received within the hold time, the connection is considered lost1. By default, the hold time is three times the keepalive time, which is 180 seconds1.
NEW QUESTION # 148
You are combining two existing interfaces into a single LAG interface, but you do not see the LAG interface being created.
Which two actions are required to solve this problem? (Choose two.)
Answer: A,B
Explanation:
To create a LAG interface, you need to perform two actions: enable LAG on the chassis and on each member interface. The first action is to configure the chassis stanza with the aggregated-devices statement and specify the number of LAG interfaces and the link-speed for each interface. The second action is to configure each member interface with the family ethernet-switching statement and the aggregated-ether-options statement with the lacp option. The name of the first LAG interface is not relevant, as long as it matches the name of the aggregated interface under the interfaces stanza. The name can be ae0, ae1, or any other valid name. References:
Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
[Junos OS Layer 2 Configuration Guide - TechLibrary - Juniper Networks]
[Junos OS Layer 2 Configuration Guide - TechLibrary - Juniper Networks]
NEW QUESTION # 149
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 # 150
Which two statements are correct about generated routes? (Choose two.)
Answer: C,D
Explanation:
A is correct because generated routes require a contributing route. A contributing route is a route that matches the destination prefix of the generated route and has a valid next hop. A generated route is only installed in the routing table if there is at least one contributing route available. This ensures that the generated route is reachable and useful. If there is no contributing route, the generated route is not added to the routing table.
B is correct because generated routes show a next hop in the routing table. A generated route inherits the next hop of its primary contributing route, which is the most preferred route among all the contributing routes. The next hop of the generated route can be either an IP address or an interface name, depending on the type of the contributing route. The next hop of the generated route can also be modified by a routing policy.
NEW QUESTION # 151
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