300-410 practice questions 571–578

1. Question 571 · 578 in bank

   Which command allows traffic to load-balance in an MPLS Layer 3 VPN configuration?

   • Amulti-paths eibgp 2
   • Bmaximum-paths 2
   • Cmaximum-paths ibgp 2
   • Dmulti-paths 2

   Show answer

   Answer: C

   Explanation

   https://www.cisco.com/c/en/us/td/docs/ios/12_2sx/feature/guide/fsxeibmp.html#wp1037690 This is how I see this based on the mentioned article. In BGP we can set different options for load sharing, depending on the design. With MPLS, we can configure "maximum-path ibgp" or "maximum-path eibgp", where the feature [ibgp] performs multipath forwarding only in PE-PE ibgp MPLS domain, and the feature [eibgp] can use both PE-PE ibgp and PE-CE ebgp domains for multipath calculations. If "maximum-paths eibgp 2" is not offered then "maximum-paths ibgp" is OK for MPLS (PE-PE) scenarios. = Answer "C"

   Source: Adapted from community discussion — HungarianDish_111

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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2. Question 572 · 578 in bank

   Select 2

   Refer to the exhibit. After applying IPsec, the engineer observed that the DMVPN tunnel went down, and both spoke-to-spoke and hub were not establishing. Which two actions resolve the issue? (Choose two.)

   

   • AChange the mode from mode tunnel to mode transport on R3.
   • BRemove the crypto isakmp key cisco address 10.1.1.1 on R2 and R3.
   • CConfigure the crypto isakmp key cisco address 192.1.1.1 on R2 and R3.
   • DConfigure the crypto isakmp key cisco address 0.0.0.0 on R2 and R3.
   • EChange the mode from mode transport to mode tunnel on R2.

   Show answer

   Answer: AD

   Explanation

   I LITERALLY just labbed this. Please forgive the long explanation but I want to share for future testers. I was torn between changing the tunnel mode or removing one address and adding the other. B and D are definitely correct. You can't just put in the command with 0.0.0.0. If you do, you will end up with two crypto key commands and both addresses so the one to the tunnel address MUST be removed. Again, NO DOUBT...B AND D!!!!!

   Source: Adapted from community discussion — Guitarman

   References

   • cisco.com documentation
   • Cisco documentation
   • Cisco documentation

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3. Question 573 · 578 in bank

   Which statement about route distinguishers in an MPLS network is true?

   • ARoute distinguishers allow multiple instances of a routing table to coexist within the edge router.
   • BRoute distinguishers are used for label bindings.
   • CRoute distinguishers make a unique VPNv4 address across the MPLS network.
   • DRoute distinguishers define which prefixes are imported and exported on the edge router.

   Show answer

   Answer: C

   References

   • Cisco documentation

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4. Question 574 · 578 in bank

   Which statement about MPLS LDP router ID is true?

   • AIf not configured, the operational physical interface is chosen as the router ID even if a loopback is configured.
   • BThe loopback with the highest IP address is selected as the router ID.
   • CThe MPLS LDP router ID must match the IGP router ID.
   • DThe force keyword changes the router ID to the specified address without causing any impact.

   Show answer

   Answer: B

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/12-4m/mp-ldp-12-4m-book.pdf

   Source: Adapted from community discussion — CraigB83

   References

   • Cisco documentation

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5. Question 575 · 578 in bank

   Which list defines the contents of an MPLS label?

   • A20-bit label; 3-bit traffic class; 1-bit bottom stack; 8-bit TTL
   • B32-bit label; 3-bit traffic class; 1-bit bottom stack; 8-bit TTL
   • C20-bit label; 3-bit flow label; 1-bit bottom stack; 8-bit hop limit
   • D32-bit label; 3-bit flow label; 1-bit bottom stack; 8-bit hop limit

   Show answer

   Answer: A

   Explanation

   A is the correct answer. In total the MPLS Label is 32 bits. (20+3+1+8) Label: Label Value, 20 bits Exp: Experimental Use, 3 bits S: Bottom of Stack, 1 bit TTL: Time to Live, 8 bits

   Source: Adapted from community discussion — ZachTL11

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6. Question 576 · 578 in bank

   Refer to the exhibit. What does the imp-null tag represent in the MPLS VPN cloud?

   

   • APop the label
   • BImpose the label
   • CInclude the EXP bit
   • DExclude the EXP bit

   Show answer

   Answer: A

   Explanation

   Just for reference: Label-Switched Path (LSP) - The path that a labeled packet traverses through a network, from label imposition to disposition. P/PE and C/CE - P and PE routers are LSRs and LERs in the context of MPLS-VPN. The term P comes from routers being in the provider network. C routers are routers found in the customer network. CE routers are the routers on the customer edge facing the provider. PE routers are provider edge routers, which connect to the CE routers. CE routers normally run plain IP (not required to be MPLS-aware). Ref: https://www.ccexpert.us/traffic-engineering/mpls-terminology.html

   Source: Adapted from community discussion — anonymous1966

   References

   • Cisco documentation

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7. Question 577 · 578 in bank

   DRAG DROP - Drag and drop the MPLS terms from the left onto the correct definitions on the right. Select and Place:

   

   This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

   Show the answer figure

   Answer: See figure below

   Explanation

   PE - Device that removes & adds the MPLS labelling; P - Device that forwards traffic based on labels; CE - Device that is unaware of MPLS labelling; LSP - Path that labelled packets takes.

   Source: Adapted from community discussion — Dave513

   

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8. Question 578 · 578 in bank

   Which transport layer protocol is used to form LDP sessions?

   • AUDP
   • BSCTP
   • CTCP
   • DRDP

   Show answer

   Answer: C

   Explanation

   Key word here is 'sessions' UDP is connectionless and can be ruled out. TCP is the answer. The other two are just there to throw you off. RDP? really?

   Source: Adapted from community discussion — ZachTL11

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300-410 practice, question 571. 578 questions available.