Title: JN0-351 Simulationsfragen, JN0-351 Pr¨¹fungsinformationen [Print This Page] Author: billree348 Time: yesterday 13:36 Title: JN0-351 Simulationsfragen, JN0-351 Pr¨¹fungsinformationen Laden Sie die neuesten Zertpruefung JN0-351 PDF-Versionen von Pr¨¹fungsfragen kostenlos von Google Drive herunter: https://drive.google.com/open?id=172H_GCEsT3SuuoluegPZM6FkxVLoznYo
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Which statement is correct about graceful Routing Engine switchover (GRES)?
A. GRES has a helper mode and a restarting mode.
B. When combined with NSR, routing is preserved and the new master RE does not restart rpd.
C. The PFE restarts and the kernel and interface information is lost.
D. With no other high availability features enabled, routing is preserved and the new master RE does not restart rpd.
Antwort: B
Begr¨¹ndung:
The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails.
GRES preserves interface and kernel information, ensuring that traffic is not interrupted.
However, GRES does not preserve the control plane.
To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR). When GRES is combined with NSR, nearly
75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES. Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur.
Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd.
116. Frage
Exhibit
You are receiving the BGP route shown in the exhibit from four different upstream ISPs.
Referring to the exhibit, which ISP will be selected as the active path?
A. ISP 2
B. ISP 3
C. ISP 4
D. ISP1
Antwort: C
Begr¨¹ndung:
Explanation
In BGP, the path selection process is based on a set of attributes1. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on1. If all these attributes are the same, then it prefers the path with the shortest AS path1.
Referring to the exhibit, all four ISPs have the same weight, local preference, and origin1. However, ISP 4 has the shortest AS path1. Therefore, ISP 4 will be selected as the active path. So, option C is correct.
117. Frage
After receiving a BGP route, which two conditions are verified by the receiving router to ensure that the received route is valid? (Choose two)
A. The loops do not exist.
B. The next hop is reachable.
C. The AS-path length is greater than 0.
D. The local preference is greater than 0.
Antwort: A,B
Begr¨¹ndung:
B is correct because the loops do not exist is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid. A loop in BGP means that a route has been advertised by the same AS more than once, which can cause routing instability and inefficiency1. To prevent loops, BGP uses the AS-path attribute, which lists the AS numbers that a route has traversed from the origin to the destination2. The receiving router checks the AS-path attribute of the received route and discards it if it finds its own AS number in the list2. This way, BGP avoids accepting routes that contain loops.
C is correct because the next hop is reachable is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid. The next hop is the IP address of the next router that is used to forward packets to the destination network3. The receiving router checks the next hop attribute of the received route and verifies that it has a valid route to reach it3. If the next hop is not reachable, the received route is not usable and is rejected by the receiving router3. This way, BGP ensures that only feasible routes are accepted.
118. Frage
You are concerned about spoofed MAC addresses on your LAN. Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)
A. IP source guard
B. dynamic ARP inspection
C. static ARP
D. DHCP snooping
Antwort: B,D
Begr¨¹ndung:
A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping. DAI discards any ARP packets that do not match the database or have invalid formats. C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports. DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client.
119. Frage
You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.
Referring to the exhibit, which two statements are correct? (Choose two.)
A. Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type
5 LSAs.
B. Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.
C. Create static routes on the switches using the local vMX router's loopback interface for the next hop.
D. Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.
Antwort: B,D
Begr¨¹ndung:
The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets. This can be resolved by redistributing the connected subnets into OSPF.
Option C suggests to configure and apply a routing policy that redistributes the connected Dallas and Denver subnets. This is correct because redistribution allows routes from one routing protocol to be communicated to another, and in this case, it allows the connected subnets to be advertised through OSPF.
Option D suggests enabling the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets. This is also correct because in OSPF, a passive interface is an interface that belongs to the OSPF router, but does not send OSPF Hello packets. It's typically used on an interface that you don't want to use for OSPF adjacencies, but you still want to advertise its IP address. Therefore, enabling passive interface can help in advertising the Dallas and Denver subnets.
120. Frage
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