This is a Cisco CCDE Practical exam demo scenario.
Please provide your Name and Email and click ‘ Start Quiz ‘ button below to start the CCDE demo scenario.
There are 34 questions in this exam. In the real exam, 25 to 35 questions are asked generally.
You will have two hours and you cannot go back to previous question when you select your answer.(Similar to real exam)
Some questions are single choice, some of them Multiple choice. For the multiple choice questions, partial scoring applies (Same in the real exam)
There are migration questions,similar to real exam and partial scoring applies for them as well.
Passing score is 80 similar to real CCDE exam.
Throughout the scenario, you will receive an emails again this is similar to real exam.Emails will provide extra bit of information and will redirect you to new set of problems.
Answers will be provided when you finish all the questions.
This is the most realistic CCDE Practical demo scenario available on the Internet and for more Scenarios and the detail explanation of this scenario, please register to the DesignWorld or any upcoming CCDE Bootcamp.
CCDE Practical Exam Demo Scenario
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Question 1 of 34
RailMail Telecom is a US Telecom company that was initially owned by Mr. Morgan 1970, Mr. Morgan sold the company 10 years later when it had 7500 paid subscribers, to National Railway Transportation (NRT) company. NRT company did not have any backbone network at the moment, and it took the another 10 years to build their own backbone network starting from West Coast in Salem, WA and all the way to Atlanta on the East Coast. Initially they had been using SONET technology but eventually they migrated to Ethernet based circuits. Currently their backbone has 100G links all over their backbone.
RMT will keep using their name , not NRT since they have an existing customer base.
RMT is still expanding heavily and their customer growth forecast is 30% year-to-year basis for the next 5-6 years. All the forecasts had been successful for far.
As RMT built their network from scratch, they planned their network very well, so they are using next IP addressing:
For Internal purposes they are using 10.0.0.0/8 block:
– /16 per Data Center
– /16 per State
– /31 for point to point links
For Public routing they are using 22.214.171.124/16 block:
– /22 per State
– /22 per Data Center
– /31 for point to point links
RMT network is QoS enabled but they did not have any need implementing it as all the backbone links are overprovisioned the way that if there’s a link failure it will there’s always enough available bandwidth and utilization does not go above 90%. There’s still some place to grow, but if they are going to have more clients, it might not be the case anymore.
Their IGP is flat ISIS L1 network. They are running BGP as external protocol and they are also using BGP as CE-PE protocol due to the corporate network security policy.
Services provides to clients:
– Internet Access
– L2VPN VPLS
– L2VPN VPWS
RMT using SAP, a TCP based application, as their CRM. It is very slow and very sensitive to any kind of delay and drops. There’s also a billing system that primarily using IPFIX to communicate with networking HW and their Corporate File Exchange protocol is NFS.
RMT is internally using Voice over IP and the video conferencing and they are utilizing FTP heavily for their HR applications specifically. They are using an entertaining application but they don’t want these applications to consume more bandwidth.
SnailMail telecom lived primarily by acquisitions. They have started in San Francisco 15 years ago and prior to this moment they acquired 3 small Service providers in the different parts of US. There was some IP addressing overlap between the POPs is Raleigh and Austin but they have been able to fix it.
All SPs are connected by full mesh GRE tunnels over the internet.
SMT uplink bandwidth to Internet Peering Points is 10G and they are using BGP as their EGP.
So far SMT was providing only Internet services to their customers.
SnailMail Telecom diagrams
SMT WAN TOPOLOGY
SMT DC TOPOLOGY
RailMail Telecom diagrams
RMT WAN TOPOLOGY
RMT DC TOPOLOGY
Email 1 is Available
Subject: Starting our project, important services
As we have mentioned previously, SMT made 3 more acquisitions few years ago. Unfortunately, they could not keep their promises to main investors so they have just sold company to RMT. Now we have to deal with it. First thing to do is identify which kind of information we are still missing before we proceed with merging both RMT and SMT.
Our main concern and top priority is that merged network should be able to provide all of our current MPLS VPN services.
Network Design Manager
Question 2 of 34
Email 14 is Available
In the future, we are planning to expand to EMEA region. Our management has found one of the small local service provider in UK that they are going to acquire within the next several months. We are looking for a cost effective short-term solution for acquisition to extend MPLS VPN services between the two networks.
We also need a good design and migration plan for a long-term solution if this acquisition goes well. We don’t have a budget issue for long haul links. As we are planning to provide different value added services for our customers, both short-term and long-term solutions must support end-to-end QoS and Multicast.
What is the fastest short-term solution to connect current RMT network and a new one in the UK?
Question 3 of 34
What might be the concern of the RMT for their IS-IS ?
Question 4 of 34
What info you need from RMT to start merging design?
Question 5 of 34
What information do you need from SMT to start merging design?
Question 6 of 34
Email 2 is Available
This is some of the information we have been able to get for you:
RMT BGP is using single AS in their network. Each Pop has a BGP RR for both BGP and VPN services.
RMT POP with Data Center architecture is given below
SMT IGP is Single area OSPF
SMT backbone network bandwidth is 2x10G links
SMT is using 10.10.0.0/16, 10.0.0.0/16, 172.16.0.0/18 and 172.22.0.0/16 IP addressing blocks
SMT does not use any MPLS VPN services at the moment but their equipment has all the support.
Also SMT has currently full mesh IBGP peering at the moment.
RMT also has 2x10G links from each POP connected to Internet Peering Points, not sure if you need this information though.
There are few other diagrams that might help you.
RMT POP Topology
SMT POP TOPOLOGY
One of RMT new network architects was concerned about current IS-IS in RMT. He thinks that we might be facing some IGP routing issues while merging RMT and SMT networks together.
Is there any problem with the current ISIS design?
Question 7 of 34
Should they migrate the IGP protocols to run a common IGP for the merged network ?
Question 8 of 34
What would be the problem if SMT wants to deploy BGP Route Reflector based on their current BGP design ? (Choose all that apply)
Question 9 of 34
Which below methods can be used eliminate the possible path visibility problem of BGP Route Reflector?
Question 10 of 34
One of our customers asked us about the best way to provide connectivity between their HQs and the remote sites. But we need to familiar with many of them. Can you help us out ?
Which table below reflects the correct attributes of the given VPN technologies?
Question 11 of 34
What is the best solution for VPN security with minimal OpEx ?
Question 12 of 34
Email 5 is Available
Subject: Bandwidth Utilization Problem
Top management and company owners have been pushing to come up with new backbone design as soon as possible. They wanted new backbone network to be simple and flexible, efficient and be able to handle any single point of failure at POPs connecting to Data Centers.
After merging both RMT and SMT we have started experiencing bandwidth utilization problems. Between different region the traffic flow always follow the shortest IGP path. Please can you help us to start sending traffic over all the available paths ?
Which would be the best short-term solution in this case?
Question 13 of 34
What is the permanent solution ? (Pick all that Apply)
Question 14 of 34
Email 6 is Available
Subject: MPLS Traffic Engineering Requirements
It seems that MPLS Traffic Engineering Strategic Approach can provide us a better capacity management. Can you help us to setup an MPLS Traffic Engineering on our network. Also we will have series of questions for you regarding MPLS Traffic Engineering.
We have been also told to provide QoS all across the new network within the next couple of months.
Which features need to be enabled in order for MPLS TE to function properly? (pick all the apply)
Question 15 of 34
Email 7 is Available
Subject: Quality of Service
We created an MPLS tunnels, RSVP and other necessary extensions are in place but unfortunately our traffic doesn’t go through the TE tunnels.
Once you help to get the traffic into the MPLS TE tunnels one little thing will left.
We still need to enable DiffServ QoS throughout our new network. One of our engineers told us that it is not possible to run both IntServ and DiffServ QoS.
Why do you think RMT cannot send traffic into the MPLS TE tunnels although everything is set ?
Question 16 of 34
Is it possible and recommended to run IntServ and DiffServ QoS in the same network?
Question 17 of 34
Customer is considering several QoS models. Which one is the best fit for the customer ?
Question 18 of 34
Email 8 is Available
Subject: Our major customers QoS SLA
We have chosen unified 1 PQ and 4 BQ model. One of our large banking customers requested MPLS VPN with 8 Class QoS model. But as a policy, we provide 3 different QoS models. Among our offerings, they can get Gold QoS Service which can give 5 classes.
Here’s brief information about QoS configuration on our gear for the Gold QoS Service :
EXP0 – Best effort, FIFO, BW remainder (all non SLA traffic by default put into EXP0)
EXP3 –CBWFQ, BW 30%
EXP4 – WRED, BW 20%
EXP5 –PQ, BW 30%
EXP1- CBWFQ , BW %5
Here’s brief information about QoS and applications configuration on our customer:
CS1 – FTP for file sharing, UDP
CS3 – Internal gaming platform, UDP,
AF33 – Internet web browsing, TCP
AF41 –Network storage replication, TCP
AF42 – Corporate CRM, TCP
EF – Videoconference, UDP, traffic loss sensitive
CS6 – Financial department business application, real-time, delay sensitive
DF- All remaining applications
Please provide the right DSCP to EXP mapping for banking customers of RMT ?
Question 19 of 34
Email 9 is Available
All our users have a problem accessing to cloud gaming application we have deployed recently and it looks like the somewhere in our network, but we are not sure where. We need your help to identify the problem!
Which part of the network should we focus on?
Question 20 of 34
Why should we put the probes there?
Question 21 of 34
Email 10 is Available
Since we have done merging, we have lots of requests from the RMT customers to extend their current VPN networks to different locations where SMT have presence at. RMT wants to have separation of their core network task from the Inter domain task, that’s why they implemented a new ASBR routers but SMT is okay with the existing routers for new inter domain communication.
Which option would you suggest to implement in order to extend your VPNs to SMT backbone?
Question 22 of 34
What is the main reason to implement it?
Question 23 of 34
What is the right set of steps in order to perform that merging?
Add link between EG1-ASBR
IS-IS between PGW1-ASBR1
IS-IS between PGW2-ASBR1
IS-IS between PGW1-ASBR1
LDP between PGW2-ASBR1
LDP between PGW1-ASBR1
Activate MP-BGP between ASBR1 and EG1
Activate MP-BGP between ASBR1 and EG2
Verify the connectivity
Remove the leftovers if any
Question 24 of 34
Email 11 is Available
One of our lead architect came up with new IP addressing scheme that new network is going to migrate to within the next 6 months. It gives us opportunity to use Inter-AS Option C.
What would be the main benefit of implementing Inter-AS Option-C between RMT and SMT?
Question 25 of 34
Email 12 is Available
As you know we have MPLS Layer 3 VPN, Internet , Point to point MPLS VPN and VPLS customers. Especially for the VPLS customers, when we want to add a new site to the current VPLS of the customers, it is operationally very hard for us to touch every PE of the customer. We afraid that this will be a bigger problem for the merged network since we want to span the VPLS and our other services throughout the merged network. But especially for the VPLS issue, we want to have an immediate solution.
Please note that we have an LDP-based VPLS in our network and the SMT network doesn’t have VPLS at all currently.
Can you help us to fix our operational problem.
Which below option is defined the RMT’s operational problem ?
Question 26 of 34
What would be your solution for their VPLS service ?
Question 27 of 34
If RMT would request to have the most granular QoS support for their Inter-AS VPLS service, which below option you would recommend ?
Question 28 of 34
Would you recommend RMT to deploy BGP-VPLS in the SMT locations ?
Question 29 of 34
Is there any problem for LDP and BGP based VPLS to support end to end VPLS ?
Question 30 of 34
Email 13 is Available
One of our customers is asking whether we can provide IPv6 L3 VPN services for them. We have not been thinking about it, but as our assessment all our networking nodes support IPv6
Which technology will help RMT to meet the requirements above?
Question 31 of 34
Which additional technology/protocol is needed as an underlay transport to support 6VPE service for RMT ?
Question 32 of 34
In case if there would be no support for 6vPE, which below methods can be implemented at Customer side in order to overcome the problem?
Question 33 of 34
What would be the problem with this short term solution ? (Choose all that apply)
Question 34 of 34
What is the best long-term solution to connect current RMT network and a new one in the UK?