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  1. Home
  2. Cisco Certification
  3. 300-410 Exam
  4. Cisco.300-410.v2024-04-03.q275 Dumps
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Question 121

Which two solutions are used to overcome a flapping link that causes a frequent label binding exchange between MPLS routers? (Choose two)

Correct Answer: A,C
...
Solution:
+ When LDP session supported by link hello is setup, create a targeted hello to protect the session.
Explanation:
Explanation
To avoid having to rebuild the LDP session altogether, you can protect it. When the LDP session between two directly connected LSRs is protected, a targeted LDP session is built between the two LSRs. When the directly connected link does go down between the two LSRs, the targeted LDP session is kept up as long as an alternative path exists between the two LSRs.
For the protection to work, you need to enable it on both the LSRs. If this is not possible, you can enable it on one LSR, and the other LSR can accept the targeted LDP Hellos by configuring the command mpls ldp discovery targeted-hello accept.
Reference:
Or from the reference
at https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/5eU6DfQV/TECMPL-3201.pdf Troubleshooting LDP Issues Problem:
insert code

Question 122

Exhibit:

BGP is flapping after the Copp policy is applied. What are the two solutions to fix the issue?
(Choose two)

Correct Answer: A,B
Explanation
The policy-map COPP-7600 only rate-limit HTTP & HTTPS traffic (based on the ACL conditions) so any BGP packets will be processed in the class "class-default", which drops exceeded BGP packets. Therefore we have two ways to solve this problem:
+ Add BGP to the ACL with the statement "permit tcp any any eq bgp"
+ Configure higher value for CIR in default class as 2Mbps is too low for web traffic (http &
https)
insert code

Question 123

Refer to the exhibit.

Users in the branch network of 2001:db8:0:4::/64 report that they cannot access the Internet. Which command is issued in IPv6 router EIGRP 100 configuration mode to solve this issue?

Correct Answer: C
insert code

Question 124

Which command displays the IP routing table information that is associated with VRF-Lite?

Correct Answer: B
Section: Layer 3 Technologies
Explanation/Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/50sg/configuration/guide/ Wrapper-46SG/vrf.html#wp1045708
insert code

Question 125

Which list defines the contents of an MPLS label?

Correct Answer: A
Explanation
The first 20 bits constitute a label, which can have 2^20 values. Next comes 3 bit value called Traffic Class. It was formerly called as experimental (EXP) field. Now it has been renamed to Traffic Class (TC). This field is used for QoS related functions. Ingress router can classify the packet according to some criterion and assign a
3 bit value to this filed. If an incoming packet is marked with some IP Precedence or DSCP value and the ingress router may use such a field to assign an FEC to the packet. Next bit is Stack bit which is called bottom-of-stack bit. This field is used when more than one label is assigned to a packet, as in the case of MPLS VPNs or MPLS TE. Next byte is MPLS TTL field which serves the same purpose as that of IP TTL byte in the IP header Reference: https://tools.ietf.org/html/rfc5462
insert code
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