Free 400-101: CCIE Routing and Switching Written Exam Questions and Answers
CCIE Routing and Switching Written is exam 400-101, part of Cisco certifications. In Cisco's current scheme the first digit gives the level: 100 is entry, 200 associate, 300 the CCNP concentration exams, 350 the CCNP core exams that also qualify you for CCIE, 500 specialist and 700 the unproctored sales exams. Older codes such as 400-, 640- and 642- predate the February 2020 restructure, when every CCNA track was collapsed into one exam and CCNP moved to a core-plus-concentration model.
Candidates comparing 400-101 exam dumps, ExamTopics and other 400-101 practice tests use this page for the answers and explanations behind each question. Download the free 400-101 PDF, then sit the timed 400-101 exam simulation before booking with Cisco.
Last updated: October 4, 2026
- Exam code
- 400-101
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- Cisco
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- First 10, with answers
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- 130 mins · 70%
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Question #1
Which two statements about 802.10 tunneling are true? (Choose two.)
Select 2 answers.
Correct answer: A, E
Explanation
The extra 802.1Q tag makes tunneled frames four bytes longer, so the system MTU must be at least 1504 bytes, and tunnel ports support MAC-based QoS along with UDLD. Layer 2 protocol tunneling of CDP, STP and VTP is not enabled by default.
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Question #2
Which protocol allows connections made by an NBMA network to dynamically learn connected address?
Correct answer: B
Explanation
Next Hop Resolution Protocol lets spokes register with and query a next-hop server on an NBMA network, dynamically resolving tunnel addresses to NBMA addresses. PPP and HDLC are point-to-point encapsulations with no such mapping function.
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Question #3
Refer to the exhibit. If R1 contacts the RADIUS server but is unable to find the user name in the server database, how will R1 respond?

Correct answer: C
Explanation
A RADIUS server that finds no matching username returns an Access-Reject, which is a definitive answer, so the router denies access. Fallback to another method occurs only when the server is unreachable and returns no response.
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Question #4
When you deploy DMVPN, what is the purpose of the command crypto is a kmp key ciscotest address 0.0.0.0 0.0.0.0?
Correct answer: B
Explanation
The wildcard address 0.0.0.0 0.0.0.0 matches any peer, so this is entered on the DMVPN hub to define one pre-shared key for all spokes whose public addresses are unknown or dynamic.
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Question #5
Refer to the exhibit. All routers are running EIGRP and the network has converged. R3 and R4 are configured as EIGRP Stub. If the link between R1 and R3 goes down, which statement is true?

Correct answer: B
Explanation
R4 is a stub, so it never advertises the 192.168.0.0/24 route it learns from R3 on to R2. R2 learned the prefix only via R1; once the R1-R3 link fails, neither R1 nor R2 has a path, and because stub routers are not queried no route goes stuck-in-active.
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Question #6
Which way to influence path selection with EIGRP is preferred?
Correct answer: D
Explanation
Delay is the preferred tuning knob because bandwidth also affects QoS, EIGRP's bandwidth-percent limit and other interface features, whereas changing delay only influences the metric even though it must be set hop by hop.
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Question #7
What are three valid HSRP states? (Choose three.)
Select 3 answers.
Correct answer: A, B, E
Explanation
HSRP moves through Initial, Learn, Listen, Speak, Standby and Active. Full and Established belong to OSPF and BGP, and the initial HSRP state is called Initial rather than INIT.
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Question #8
External EIGRP route exchange on routers R1 and R2 was failing because the routers had duplicate router IDs. You changed the eigrp router-id command on R1, but the problem persists. With additional action must you take to enable the routers to exchange routes?
Correct answer: D
Explanation
A new EIGRP router ID is not used by the running process until it is restarted, so clearing the EIGRP process forces the router to advertise external routes with the new ID and the duplicate-ID condition clears.
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Question #9
Which two statements about 1Pv6 6to4 tunnels are true? (Choose two)
Select 2 answers.
Correct answer: A, C
Explanation
6to4 sites are numbered from 2002::/16 with the embedded IPv4 address, and a single 6to4 relay address serves many destinations, making the tunnel point-to-multipoint. No GRE encapsulation is used; protocol 41 carries the traffic.
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Question #10
What is the source MAC address of a BPDU frame that is sent out of a port?
Correct answer: C
Explanation
Each BPDU is sourced with the MAC address of the physical port transmitting it, while the bridge ID inside the BPDU carries the switch's base MAC address.
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Discussion
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FAQ
Learn More: https://www.cisco.com/site/us/en/learn/training-certifications/certifications/index.html
- Q1: What is the 400-101: CCIE Routing and Switching Written exam?
- A: 400-101: CCIE Routing and Switching Written is a Cisco certification exam. Judging by the questions in our bank, it concentrates on eigrp, routers, guard, router and ipv6.
- Q2: What topics does the 400-101: CCIE Routing and Switching Written exam cover?
- A: Questions in our 400-101: CCIE Routing and Switching Written bank cluster around eigrp, routers, guard, router, ipv6, tunneling, cisco and route. Working through the full set is the quickest way to find which of these you are weakest on.
- Q3: How should I prepare for 400-101: CCIE Routing and Switching Written?
- A: Work through the 400-101: CCIE Routing and Switching Written practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
- Q4: Are these real 400-101: CCIE Routing and Switching Written exam questions?
- A: They are drawn from officially released past questions and from community members who have sat 400-101: CCIE Routing and Switching Written. Answers are verified and updated weekly.
- Q5: Where do I register for the 400-101: CCIE Routing and Switching Written exam?
- A: Register through Cisco directly at https://www.cisco.com/site/us/en/learn/training-certifications/certifications/index.html. Exampractice is not affiliated with Cisco and does not administer the exam.
- Q6: Is there a free 400-101: CCIE Routing and Switching Written sample?
- A: Yes. Every 400-101: CCIE Routing and Switching Written page shows a free sample of real questions. Upgrading opens the full bank and the practice test.
- Q7: What are Cisco Certification Exams?
- A: Cisco Certification Exams validate your expertise in using and managing Cisco networking and IT solutions. These certifications demonstrate your proficiency in designing, implementing, and troubleshooting Cisco-based networks and systems, covering areas such as routing and switching, security, wireless, data center, and collaboration.
- Q8: Why should I pursue Cisco Certification?
- A: Cisco Certification enhances your professional credibility, showcasing your skills and knowledge in Cisco technologies. This can lead to better job opportunities, higher salaries, and career advancement in networking and IT industries.
- Q9: What are the benefits of Cisco Certification?
- A: Benefits include recognition as a certified networking professional, improved job performance, access to exclusive resources, continuing education opportunities, and staying current with the latest Cisco technologies and best practices.
- Q10: Who should take Cisco Certification Exams?
- A: Network engineers, system administrators, IT professionals, and anyone involved in designing, implementing, and managing network solutions using Cisco products should consider these certifications to validate their expertise and advance their careers.
- Q11: What types of Cisco Certification Exams are available?
- A: Cisco offers various certification paths, including:
- Q12: How do I prepare for Cisco Certification Exams?
- A: Preparation can include official Cisco training courses, study guides, practice exams, online tutorials, and hands-on experience with Cisco networking equipment and solutions.
- Q13: Where can I take Cisco Certification Exams?
- A: Cisco Certification Exams can be taken at authorized Pearson VUE testing centers worldwide or online, providing flexibility to fit your schedule and location.
- Q14: How do Cisco Certifications impact my career?
- A: Cisco Certifications significantly boost your career by demonstrating your expertise to employers, making you a more competitive candidate for advanced roles and promotions in networking and IT.
- Q15: Are there any prerequisites for Cisco Certification Exams?
- A: Some exams may have prerequisites, such as foundational knowledge or prior certifications. Check the specific requirements for each certification path on the Cisco website.
- Q16: How often do I need to recertify for Cisco Certifications?
- A: Cisco Certifications typically require recertification every three years to ensure that certified professionals stay updated with the latest networking technologies and industry practices.



