300-410 practice questions 321–330

1. Question 321 · 578 in bank

   

   Refer to the exhibit. The administrator noticed that the connection was flapping between the two ISPs instead of switching to ISP2 when the ISP1 failed. Which action resolves the issue?

   • AInclude a valid source-interface keyword in the icmp-echo statement.
   • BReference the track object 1 on the default route through ISP2 instead of ISP1.
   • CModify the static routes to refer both to the next hop and the outgoing interface.
   • DModify the threshold to match the administrative distance of the ISP2 route.

   Show answer

   Answer: A

   Explanation

   If you ISP 1 fails the IP SLA will start pinging out via ISP 2. They the IP SLA will start responding again and put the static router back in for ISP 1. This will continue until ISP is back online. IP SLA 1 icmp-echo 8.8.8.8 source-interface g1/0

   Source: Adapted from community discussion — DUBC89x

   References

   • cisco.com documentation

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2. Question 322 · 578 in bank

   

   Refer to the exhibit. An administrator must harden a router, but the administrator failed to test the SSH access successfully to the router. Which action resolves the issue?

   • ASSH must be allowed with the transport output ssh command.
   • BConfigure enable secret to log in to the device.
   • CSSH syntax must be ssh -l user ip to log in to the remote device.
   • DConfigure SSH on the remote device to log in using SSH.

   Show answer

   Answer: C

   Explanation

   ENARSI ->Chapter 23-> SSH: When establishing an SSH connection from a Cisco IOS device, you need to specify the username in the ssh command. If you omit the username, you will receive the following error message: % No user specified nor available for SSH client

   Source: Adapted from community discussion — blueblue2

   References

   • cisco.com documentation

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3. Question 323 · 578 in bank

   Which MPLS value is combined with the IP prefix to convert to a VPNv4 prefix?

   • A8-byte Route Distinguisher
   • B8-byte Route Target
   • C16-byte Route Target
   • D16-byte Route Distinguisher

   Show answer

   Answer: A

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4. Question 324 · 578 in bank

   Select 2

   What are the two reasons for RD and VPNv4 addresses in an MPLS Layer 3 VPN? (Choose two.)

   • AVPN RT communities are used to identify customer unique routes.
   • BWhen the PE redistributes customer routes into MP-BGP, they must be unique.
   • CThey are on a CE device to use for static configuration.
   • DThey are used for a BGP session with the CE device.
   • ERD is prepended to each prefix to make routes unique.

   Show answer

   Answer: BE

   Explanation

   As its name implies, a route distinguisher (RD) distinguishes one set of routes (one VRF) from another. It is a unique number prepended to each route within a VRF to identify it as belonging to that particular VRF or customer. An RD is carried along with a route via MP-BGP when exchanging VPN routes with other PE routers. https://packetlife.net/blog/2013/jun/10/route-distinguishers-and-route-targets/

   Source: Adapted from community discussion — HungarianDish_111

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5. Question 325 · 578 in bank

   Select 2

   An engineer configured a leak-map command to summarize EIGRP routes and advertise specifically loopback 0 with an IP of 10.1.1.1 255.255.255.252 along with the summary route. After finishing configuration, the customer complained about not receiving the summary route with the specific loopback address. Which two configurations will fix this issue? (Choose two.) router eigrp 1 ! route-map Leak-Route deny 10 ! interface Serial 0/0 ip summary-address eigrp 1 10.0.0.0 255.0.0.0 leak-map Leak-Route

   • Aaccess-list 1 permit 10.1.1.0 0.0.0.3
   • Baccess-list 1 permit 10.1.1.1 0.0.0.252
   • Caccess-list 1 and match under route-map Leak-Route
   • Droute-map Leak-Route permit 10 and match access-list 1
   • Eroute-map Leak-Route permit 20

   Show answer

   Answer: AD

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6. Question 326 · 578 in bank

   

   Refer to the exhibit. AS 111 must not be used as a transit AS, but ISP-1 is getting ISP-2 routes from AS 111. Which configuration stops Customer AS from being used as a transit path on ISP-1?

   • Aip as-path access-list 1 permit.*
   • Bip as-path access-list 1 permit_111_
   • Cip as-path access-list 1 permit ^$
   • Dip as-path access-list 1 permit ^111$

   Show answer

   Answer: D

   Explanation

   -solution C) if applied on customer edge -solution D) if applied on ISP1 -> in this case it is -from neighbor 192.168.11.111, receive only the routes originated from AS 111 (and no Internet routes) At the end: clear ip bgp x.x.x.x soft in https://community.cisco.com/t5/routing/bgp-using-as-path-filtering/td-p/1251694 https://www.ciscopress.com/articles/article.asp?p=169556

   Source: Adapted from community discussion — HungarianDish_111

   References

   • cisco.com documentation

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7. Question 327 · 578 in bank

   What is considered the primary advantage of running BFD?

   • Areduction in time needed to detect Layer 3 routing neighbor failures
   • Breduction in CPU needed to detect Layer 3 routing neighbor failures
   • Creduction in time needed to detect Layer 2 switched neighbor failures
   • Dreduction in CPU needed to detect Layer 2 switch neighbor failures

   Show answer

   Answer: A

   Explanation

   https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html BFD can be used at any protocol layer. However, the Cisco implementation of BFD for Cisco IOS Releases 12.2(18)SXE, 12.0(31)S, and 12.4(4)T supports only Layer 3 clients, in particular, the BGP, EIGRP, IS-IS, and OSPF routing protocols.

   Source: Adapted from community discussion — HungarianDish_111

   References

   • Cisco documentation

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8. Question 328 · 578 in bank

   

   Refer to the exhibit. R2 can access content on the server successfully. A network engineer finds packet drops on PC1 for traffic destined to network 2.2.2.2/32. Which action resolves the issue?

   • ARedistribute the connected metric in EIGRP.
   • BAdd the eigrp stub connected static command.
   • CRedistribute the static metric in EIGRP.
   • DRemove the eigrp stub connected command.

   Show answer

   Answer: C

   Explanation

   it is true the redistribute static command is needed but after that it still won't work... as the "eigrp stub static" & "eigrp stub connected" were typed as 2 separate commands the latter overwrote the first thus still no advertising of static routes..

   Source: Adapted from community discussion — upp3r

   References

   • cisco.com documentation

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9. Question 329 · 578 in bank

   Which method changes the forwarding decision that a router makes without first changing the routing table or influencing the IP data plane?

   • Anonbroadcast multiaccess
   • Bpacket switching
   • Cpolicy-based routing
   • Dforwarding information base

   Show answer

   Answer: C

   Explanation

   PBR takes precedence from Routing table when it comes to routing decisions iff it is configured already. So it makes sense that it is answered as C.

   Source: Adapted from community discussion — siscoFe

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10. Question 330 · 578 in bank

    

    Refer to the exhibit. The OSPF routing protocol is redistributed into the BGP routing protocol, but not all the OSPF routes are distributed into BGP. Which action resolves the issue?

    • AInclude the word external in the redistribute command
    • BUse a route-map command to redistribute OSPF external routes defined in an access list
    • CInclude the word internal external in the redistribute command
    • DUse a route-map command to redistribute OSPF external routes defined in a prefix list

    Show answer

    Answer: C

    Explanation

    The material from cisco states first that: "If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default." But then it says in order to distribute ONLY External Type 1 and Type 2 routes, you use the "external" keyword. So reasoning on that, I am going with C. Include the word internal external in the redistribute command https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5242-bgp-ospf-redis.html

    Source: Adapted from community discussion — MrThinMints

    References

    • Cisco documentation

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300-410 practice, question 321. 578 questions available.