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OSPF Sim

May 8th, 2014 in Lab Sim, LabSim Go to comments

Question

OSPF is configured on routers Amani and Lynaic. Amani’s S0/0 interface and Lynaic’s S0/1 interface are in Area 0. Lynaic’s Loopback0 interface is in Area 2.

OSPFSim

Your task is to configure the following:

Portland’s S0/0 interface in Area 1
Amani’s S0/1 interface in Area 1
Use the appropriate mask such that ONLY Portland’s S0/0 and Amnani’s S0/1 could be in Area 1.
Area 1 should not receive any external or inter-area routes (except the default route).

Answer and Explanation:

First, we configure Portland’s S0/0 interface so that it belongs to Area 1. So, we have to find out which sub-network the IP address 192.168.4.5/30 (the IP of interface S0/0 of Portland) belongs to. This address belongs to a subnetwork which has:

Increment: 4 (/30 = 255.255.255.252 or 1111 1111.1111 1111.1111 1111.1111 1100)
Network address: 192.168.4.4 (because 4 = 4 * 1 and 4 < 5)
Broadcast address: 192.168.4.7 (because 7 = 4 + 4 – 1) (It is not necessary to find out the broadcast address but we should know it)

The question requires that only Portland’s S0/0 and Amani’s S0/1 could be in Area 1, therefore we must use a wildcard of 0.0.0.3 (this wildcard is equivalent with a subnet mask of /30) so that there are only 2 IP addresses can participate in area 1 (they are 192.168.4.5 & 192.168.4.6). The full command we use here is network 192.168.4.4 0.0.0.3 area 1

The question also requires that “Area 1 should not receive any external or inter-area routes (except the default route)”. Recall that if we don’t want the router to receive external routes, we have to stop LSA Type 5. And if we don’t want to receive inter-area routes, we have to stop LSA Type 3 and Type 4. Therefore we have to configure area 1 as a totally stubby area. For your information, here is the definition of a totally stubby area:

Totally stubb area – This area does not accept summary LSAs from other areas (types 3 or 4) or external summary LSAs (Type 5). Types 3,4 and 5 LSAs are replaced by the Area Border Router(ABR) with a default router. Totally stubby areas protect internal routers by minimizing the routing table and summarizing everything outside the area with a default route.” (CCNP BSCI Official Exam Certification Guide, Fourth Edition)

In conclusion, we have to configure area 1 as a totally stubby area. We do that by configuring Portland as stub and configuring Amani (ABR router) as a stub + “no-summary”suffix.

+ Configure Portland router as a stub:

Portland#configure terminal
Portland(config)#router ospf 1

Allow network 192.168.4.4/30 to join Area 1, notice that you have to convert subnet mask into wildcard mask:

Portland(config-router)#network 192.168.4.4 0.0.0.3 area 1

Configure Portland as a stub:

Portland(config-router)#area 1 stub

Portland(config-router)#end
Portland#copy running-config startup-config

+ Configure Amani router as a “totally stub”:

Amani#configure terminal
Amani(config)#router ospf 1
Amani(config-router)#network 192.168.4.4 0.0.0.3 area 1

Make area 1 become a totally stubby area, notice that we can only use this command on ABR router:

Amani(config-router)#area 1 stub no-summary

Amani(config-router)#end
Amani#copy running-config startup-config

Note: Make sure to check the OSPF process ID before typing your configuration. Maybe it is not OSPF process 1 like the configuration above.

 

Other lab-sims on this site:

EIGRP Stub Sim

EIGRP OSPF Redistribution Sim

IPv6 OSPF Virtual Link Sim

EIGRP Simlet
Policy Based Routing Sim

 

Comments
Comment pages
1 11 12 13 84
  1. Anonymous
    October 3rd, 2016

    Please send the dump for route to me at cisco.ggll @ gmail

  2. gammi
    October 5th, 2016

    Hard to pass today. 149q valid only 10-15%. Lab 100%.

  3. NetworkO
    October 6th, 2016

    in the exam if you configure stub area 1 no-sum in the amani you cannot ping the Lynaic loopback from Portland so that must be wrong.
    (in the exam the opsf is 90 and the area is 13 instead of 1, but it does not matter…)

  4. NetworkO
    October 6th, 2016

    First. Question mark “?” did not work in my fkcn keyboard. 45 min for finding the guy to check the thing… of course, not solution was provided. I have had to do it without “?”.
    Second. OSPF lab.. when configuring AREA 13 (the one that should be stub) in the ARB, with the area 13 stub no-sum … it did not create a default route in the other guy to ping the other side of the network’s loopback. I do not know if it is a problem with the simulator or what, but the topic said you must be able to ping it, if i did not remove the stub portion in the ARB i was not able to ping it. I also realize there was ip subnet zero on each router… it does not matter, but the most restrictive mask is 0.0.0.0, not 0.0.0.3 like this page shows… even with 0.0.0.2 it should work.

    New questions:
    which IP SLA blablabla to monitor entreprise class network (chose 3)
    – bandwidth
    – delay
    – reliability
    – packet loss
    – traps
    – connectivity

    CEF at what layer works
    – Layer 3
    – Layer 2
    – Layer 4
    – Layer my ass

    Something about an administrator wants to know when an IP SLA threshold is reached..
    – MOS
    – Treshold action
    – Cisco EMS
    – SNMP traps
    – IOS balblalb

    AD for EBGP
    – 20
    – 200
    – 90
    – 10

    Something about the output of show isakmp sa
    that shows this output:
    source ip (some ip), dest ip (another ip), state -> QM_IDLE, conn-id -> 3, slot -> active
    and you have to say if it is something missing, if it is a default config, etc. 4 options, 1 correct I think.

    Another one about how a tunnel destination should work in a default mode
    – something about reverse redirects
    – something about redirects again.
    – something about nothing.
    – something about you have to configure a route for the tunnel to work.

    The frame-relay question o posted before… but 2 options.
    – Disable split horizon
    – make subinterfaces
    the incorrect ones i didnt remember. But I am 100% sure those are the correct ones.

    One to say why EVN trunks

    One that you should know what unicast, multicast, anycast, broadcast means and you will pass it

    NTP acl and master and peer and serv
    basically, the autunm configured, the server trusted is ip blalbal and peer trusted its ip blablabla

    NPTv6 stateless
    – one-to-one

    …. I will post more if i remember.

    49 q, 5 labs, 1 drag and drop (CHAP, its in the comments, very easy, challenge 1st, md5 2nd, terminates 3rd).

    Hope it helps

  5. NetworkO
    October 6th, 2016

    another thing. The lab of OSPF SIM:
    It asked for LSA 4 Type age in Area 1 for R5 from R3.

    AREA 1 in R5 or R3 didn’t exist, was area 2. LSA 4 Type… FKCN CISCO.
    So I used the value of Area 2, cause there was not option saying “that is impossible”

  6. Alice
    October 8th, 2016

    Hello
    Pls send me last 300-101 dump or pdf
    Thx

    copurkaya @ gmail . com

  7. 300-101
    October 10th, 2016

    @NetworkO Please do you have the dumps? please send to ftheodore1 @ yaoo.com

  8. RPM
    October 12th, 2016

    Adding to networkO questions,
    1. Which is the best place to run debug to get excessive amount of information
    -SNMP meesages
    – Aux port
    -console
    -line vty

  9. RPM
    October 12th, 2016

    – there were 2 questions from IPv4 NAT so study about it
    one was
    ip nat inside source static tcp 192.168.1.20 80 192.168.1.20 8080
    options i do not remember clearly but something like
    – router will translate packet from 192.168.1.20 80 to 192.168.1.20 8080
    – only tcp packets will be accepted on port 80 or 8080
    – router will translate packet from 192.168.1.20 8080 to 192.168.1.20 80
    – do not remember the last one

  10. Anonymous
    October 16th, 2016

    please can any one send dumps 300-101 here is my e-mail address {email not allowed}

  11. AMAN
    October 16th, 2016

    please can any one send dumps 300-101 here is my e-mail address {email not allowed}

  12. AMAN
    October 16th, 2016

    please can any one send dumps 300-101 here is my phone number 901337-9862

  13. HELP ME
    October 24th, 2016

    Hi can you please send me dumps ruvieh @ outlook . com . ph
    THANK YOU
    :*

  14. Mansolo
    October 26th, 2016

    please can any one send dumps 300-101 last update here is my e-mail address : {email not allowed}
    because i fail exam 677 on 20Oct2016 dumps 149 different
    Thank you.

  15. Mansolo
    October 26th, 2016

    please can any one send dumps 300-101 last update here is my e-mail address : likhit52 @ hotmail . com
    because i fail exam 677 on 20Oct2016 dumps 149 different
    Thank you.

  16. Akat
    October 26th, 2016

    Please could anyone send valid October 2016 300 -101 dumps to akataps2016(at)gmail(dot)com

  17. youssef
    October 26th, 2016

    Please could anyone send valid October 2016 300 -101 dumps to {email not allowed} Thanks a lot.

  18. youssef
    October 26th, 2016

    Please could anyone send valid October 2016 300 -101 dumps to youssemerroun33(at)gmail(dot)com Thanks a lot.

  19. Jame
    October 27th, 2016

    Hi Mansolo, What is different change in your exam. Can you share your knowladge? e.g. Lab sim or multiple choose?

  20. Anonymous
    November 1st, 2016

    Kaif. Please send the dumps i need to study and give the exam my email is {email not allowed}

  21. learningCCNP
    November 7th, 2016

    Thank you, to the person who posted the questions…..
    Please confirm answers before using on exam

    Question. 1
    In which two ways can split horizon issues be overcome in a Frame Relay network environment? (choose two.)
    C. Configuring multiple sub-interfaces on a single physical interface to various remote sites.
    E. Disabling split horizon

    Question.2
    Which Easy Virtual Networking configuration component significantly decreases network configuration?
    B. Virtual Network Trunk

    Question. 3
    A network engineer receives reports about poor voice qualify issues at a remote site. The network engineer does a packet capture and sees out-of-order packets being delivered. Which option can cause the VoIP quality to suffer?
    B. Load balancing over redundant links

    Question. 4
    Other than a working EIGRP configuration, which option must be the same on all routers for ELGRP
    authentication key role over to work correctly?
    C. Passwords

    Question. 5
    Refer to the following configuration command.
    Router(config)# ip nat inside source static tcp 172.16.10.8 8080 172.16.10.8 80
    Which statement about the command is true ?
    B. Any packet that is received in the inside interface with a source IP port address of 172.16.10.8:8080 is translated to 172.16.10.8:80.

    Question. 6
    Refer to the exhibit. A network engineer has configured GRE between two IOS routers. The state of the tunnel interface is continuously oscillating between up and down. What is the solution to this problem?
    A. Create a more specific static route to define how to reach the remote router.

    Question. 7
    What type of IPv6 packet will indicate traffic from single host and single node?

    D. Unicast

    Question.8
    Which two attributes describe UDP within a TCP/IP network? (Choose two.)
    B. Unreliable delivery
    C. Connectionless communication

    Question. 9
    What command can you enter to configure an enable password that uses an encrypted password from another configuration?
    F. Enable secret 5 $abc%!#.Cd34$!ao0

    Question.10
    Which three IP SLA performance metrics can you use to monitor enterprise-class networks? (Choose
    three.)
    A. Packet loss
    B. Delay
    C. Connectivity

    Question.12
    Refer to the exhibit showing complete command output. What type of OSPF router is router A?
    A. ABR

    Question. 13
    What is the optimal location from which to execute a debug command that produces an excessive amount of information?
    A. Vty lines

    Question. 14
    Which two statements about NTP operation are true? (Choose two.)
    A. If multiple NTP servers are configured, the one with the lowest stratum is preferred
    B. By default, NTP communications use UDP port 123.

    Question. 15
    A network engineer wants to display the statistics of an active tunnel on a DMVPN network. Which command should the administrator execute to accomplish this task?
    A. Router#show crypto ipsec sa

    Question. 16
    In which from does PAP authentication send the user name and password across the link?
    C. Clear text

    Question. 17
    Refer to the exhibit. Router 1 cannot ping router 2 via the Frame Relay between them. Which two statements describe the problems? (Choses two.)
    A. Encapsulation is mismatched.
    D. DLCL is inactive or deleted.

    Question. 18
    Refer to the exhibit. A network engineer is troubleshooting a DMVPN setup between the hub and the spoke. The engineer execute the command show crypto isakmp sa and observes the output that is displayed. What is the problem?
    B. That ISAKMP is using default settings

    Question. 19
    When a tunnel interface is configured in the default mode, which statement about routers and the tunnel destination address is true?
    A. The router must have a route installed toward the tunnel destination.

    Question.20
    A network engineer is configuring the router for NetFlow data exporting. What is required in order for NDE to begin exporting data?
    C. Destination

    Question. 21
    At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?
    B. Layer 2

    Question. 22
    Which two functionalities are specific to stateless NAT64? (Choose two.)
    B. It does not conserve Ipv4 addresses.
    C. It provides 1-to-1 translation.

    Question. 23
    A network engineer wants to ensure an optimal end-to-end delay bandwidth product. The delay is less than 64 KB. Which TCP feature ensures steady state throughput?
    A. Window scaling
    Question. 24
    Which IP SLA operation can be used to measure round-trip delay for the full
    B. ICMP path echo

    Question. 25
    What is the administrative distance for EBGP?
    D. 20

    Question. 26
    Considering the Ipv6 address independence requirement, which process do you avoid when you use NPTv6 for translation?
    A. Rewriting of higher layer information

    Question. 27
    An engineer is using a network sniffer to troubleshoot DHCPv6 between a router and hosts on the LAN with the following configuration.
    Interface Ethernet0
    Ipv6 dhcp server DHCPSERVERPOOL rapid-commit
    !
    Which two DHCPv6 messages will appear in the sniffer logs? (Choose two.)
    A. Acknowledge
    F. Solicit

    Question. 28
    What is the function of the snmp-server manger command?
    C. To enable the device to send and receive SNMP requests and responses

    Question.29
    A network administrator notices that the BGP state drops and logs are generated for missing BGP hello keepalives. What is the potential problem?
    D. MTU mismatch

    Question. 30
    A network administrator creates a static route that points directly to a multiaccess interface, instead of the next-hop IP address. The administrator notices that Cisco Express Forwarding ARP requests are being sent to all destinations. Which issue might this configuration create?
    C. Cisco Express Forwarding routing loop

    Question. 31
    Refer to the exhibit. Which three NTP features can be deduced on the router? (Choose three.)
    A. Only is in stratum 4
    B. Only accepts time requests from 192.168.1.1
    E. Only updates its time from 192.168.1.4

    Question. 32
    A network engineer wants to notify a manager in the event that the IP SLA connection los threshold is reached. Which two features are needed to implement this functionality? (Choose two.)
    A. SNMP traps
    E. Threshold action

    Question. 33
    A network engineer notices that transmission rates of senders of TCP traffic sharply increase and decrease simultaneously during periods of congestion. Which condition causes this?
    A. global synchronization

    Drag and drop the challenge Handshake Authentication Protocol steps from the left into the correct order in which they occur on the right.

    Step 1 When the LCP phase is complete, and CHAP is negotiated between both devices, the authenticator sends a challenge message to the peer.

    Step 2 The peer responds with a value calculated through a one-way hash function (MD5)

  22. Anil Kumar
    November 13th, 2016

    Please send me the ccnp route 300-101 dumps : my ID is {email not allowed}.

  23. Anil Kumar
    November 13th, 2016

    Please send me the ccnp route 300-101 dumps my gamil ID is “ping2anilkumar”

  24. Anonymous
    November 22nd, 2016

    Why not use a /31 for the link? as this is more restrictive than a /30. And don’t tell me it won’t work. I’ve used /31 OSPF links hundreds of times in production networks.

  25. Anonymous
    November 25th, 2016

    Hi all please guys can you share the update dump I’m doing my routing next week my email :khaloood88852at yahoo dot com

  26. Bogart
    November 25th, 2016

    because you are a completely idiot that’s why we don’t use /31 prefix..

  27. Anonymous
    November 27th, 2016

    K, I’m not sure what you mean. /31 links are the industry standard.

  28. Anonymous
    November 28th, 2016

    Back to the question on the most specific mask, why not use the interface physical addresses with a 0.0.0.0 wildcard on each device, surely this is the most specific?

    Portland 192.168.4.5 0.0.0.0
    Amani 192.168.4.6 0.0.0.0

  29. noob
    December 2nd, 2016

    you can use /31 on the serial point to point links because no broadcast needed and this will also help preventing ip loss

  30. Anonymous
    December 10th, 2016

    wouldnt the portland router also need the
    area 1 stub no summary command ?

  31. Mike
    December 11th, 2016

    Guys,
    In Seattle-Chicago OSPF LAB, Don’t you think to block External and Inter-area routes in ARea21 ( Stub Area), We need to use
    #area 21 stub no summary command not just #area 21 stub
    Anyone who did pass the test try this command yet or been using the # area 21 stub Only ???

    Ref:http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13692-21.html

  32. Mike
    December 11th, 2016

    Hey Man Sorry I also misunderstood this, I though they didn’t use no-summary at all,
    So they are correct we only use no-summary on ABR router which is Area Boundary router who sends and receives LSAs from other areas. So only ABR needs to generate a default route by adding no-summary in it.

  33. Mike
    December 11th, 2016

    Another suggestion for OSPF SEA-CHI Lab,

    If they ask for the “most specific” the best option is the network statement with the all zero wildcard mask. Because I work in a service-provider environment and we always use 0.0.0.0 with /30 subnet.
    Keith Barker CBT Nuggets endorses that in the following link.
    Ref: https://learningnetwork.cisco.com/thread/39121

  34. azexam
    December 13th, 2016

    Please share dumps if you can tweetny22 at aol.com. Happy holidays all!

  35. chekov
    December 13th, 2016

    difference is

    x.x.x.x 0.0.0.0 –> host within that subnet (ip of the interface has to be used)
    x.x.x.x 0.0.0.3 –> subnet (network ip of the subnet has to be used)

    both works

    more specific is the 0.0.0.0 for sure. i guess it depends on the question. if you have to put the link between the routers in area x, the 0.0.0.0 should be better. but i can’t imagine that it makes a big difference for them. both works and that difference doesn’t show what a student really knows. it just shows that he might think a little different.

  36. Salman
    December 15th, 2016

    Hi all Kindly send me the latest dumps of CCNP Route i have to give paper in next week, Thanks
    email add is “salman underscore saeed 1992 at yahoo dot com”

  37. olats
    December 17th, 2016

    @chekov ===>

    In my opinion:

    x.x.x.x 0.0.0.0 -> I use this one for a specific host. for example
    ip address 192.168.1.32/24
    network 192.168.1.32 0.0.0.0

    x.x.x.x 0.0.0.3 -> I use this one for a specific network. for example
    ip address 192.168.1.5/30
    network 192.168.1.4 0.0.0.3

    my opinion only..

  38. Help
    December 24th, 2016

    I have one query regarding this.
    The book written by Cisco does not teach us like the method to solve this question is displayed over here.
    So, how one can solve this questions.

  39. Anonymous
    December 30th, 2016

    @learningCCNP
    Question. 27 is wrong!
    An engineer is using a network sniffer to troubleshoot DHCPv6 between a router and hosts on the LAN with the following configuration.
    Interface Ethernet0
    Ipv6 dhcp server DHCPSERVERPOOL rapid-commit
    !
    Which two DHCPv6 messages will appear in the sniffer logs? (Choose two.)
    A. REPLYYYYYYYYYYYYYYYYYYYY
    F. Solicit

    2 message dhcp transaction

  40. Anonymous
    December 30th, 2016

    Where can we download the dumps for this exam (preferably the VCE file)?

  41. Anonymous
    January 2nd, 2017

    Dumps. Dumps. Where are the dumps please???

  42. Anonymous
    January 5th, 2017

    Anyone have the URL for where the dumps may be found?

  43. Benji
    January 9th, 2017

    Is the OSPF Sim solution from here other than process ID and area no. the same in the real exam? The commands “area (no) stub” and “area (no) stub no-summary” still required? I’m little bit confused…… Is this alternative solution correct for those who did the exam recently?…….. (See link below)

    http://m.imgur.com/2H0ZKfg?r

  44. CoolGuy
    January 11th, 2017

    Cleared Exam Today … !!!!
    149Q +Tagwa 41 Qs are still valid.
    Got the followng Labs+Sim in exam
    OSPF Evaluation
    EIGRP OSPF Redistribution
    Policy Based Routing
    OSPFv3 Virtual Link
    Thanks DigitalTut and all those who shares their knowledge and useful stuff.
    Others who are preparing or ready to take exam — Best Of Luck —

  45. Cool GUy
    January 11th, 2017

    I have read this comment and copied it from the Guy named Cool Guy.
    11/1/2017
    Cleared Exam Today … !!!!
    149Q +Tagwa 41 Qs are still valid.
    Got the followng Labs+Sim in exam
    OSPF Evaluation
    EIGRP OSPF Redistribution
    Policy Based Routing
    OSPFv3 Virtual Link
    Thanks DigitalTut and all those who shares their knowledge and useful stuff.
    Others who are preparing or ready to take exam — Best Of Luck —

  46. Anonymous
    January 14th, 2017

    Where can we download 149q and Taqwa 41q ????

  47. Anonymous
    January 17th, 2017

    Anyone ever use this website for exam info?

  48. malik
    January 17th, 2017

    I passed my exam today with 947 marks. 149 + 41 are 100% valid. All questions from these two dumps nothing else.
    OSPF V3
    OSPF Evaluation
    Redistribution
    PBR
    OSPF V2

    CHAP Drag and Drop

  49. osamafrom_Jordan
    January 19th, 2017

    this one is changed in the exam but it simple case
    no need to configure the stub it is just asking for normal configuration of ospf (networks and areas)
    any help or query write to me

    osamamelhim at gmail dot com

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