Free Implementing Cisco Enterprise Network Core Technologies Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Implementing Cisco Enterprise Network Core Technologies practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1In a two-tier campus design, which functions are combined in the collapsed core?

   1. A. Access and distribution functions
   2. B. Distribution and core functions
   3. C. Access and core functions
   4. D. Access, distribution, and core functions

   Answer: B

   Explanation: Cisco describes a "Two-tier design: Distribution layer functioning as a collapsed core". The distribution and core roles share a tier while access remains separate. Combining access with distribution, combining access with core, or collapsing all three functions does not describe this two-tier model.

   Reference: Campus LAN and Wireless LAN Solution Design Guide — Design Fundamentals: Campus Wired LAN — Two-tier design

2. 2Which statement correctly distinguishes a type 1 hypervisor from a type 2 hypervisor?

   1. A. Type 1 runs on a host OS; type 2 runs directly on hardware
   2. B. Type 1 supports one guest OS; type 2 supports several guest OSs
   3. C. Type 1 runs directly on hardware; type 2 runs as a layer on a host OS
   4. D. Type 1 virtualizes storage only; type 2 virtualizes CPU and memory

   Answer: C

   Explanation: Red Hat states that a type 1 hypervisor "runs directly on the host’s hardware" and that type 2 "is run on a conventional operating system as a software layer or application." The distinction is placement in the execution stack, not guest count or which resource types are virtualized.

   Reference: What is a hypervisor? — Types of hypervisors — Type 1 and Type 2

3. 3Two connected Catalyst switch ports are both configured with `switchport mode dynamic auto`. The link remains an access link. With all other trunk parameters compatible, which change enables DTP to negotiate a trunk?

   1. A. Set one port to dynamic desirable
   2. B. Set both ports to access mode
   3. C. Apply nonegotiate to both auto ports
   4. D. Change only the access VLAN on one port

   Answer: A

   Explanation: Cisco states that dynamic auto becomes a trunk when the neighbor "is set to trunk or desirable mode." Auto/auto does not initiate the required negotiation; changing one end to desirable does.

   Reference: Configuring VLAN Trunks — Information About VLAN Trunks — Layer 2 Interface Modes

4. 4A router can ping a remote server using its outbound WAN address. An engineer must test whether that server can reply to the router's LAN-interface address instead. Which extended-ping parameter directly changes the address being tested for the return path?

   1. A. Datagram size
   2. B. Source address or interface
   3. C. Repeat count
   4. D. Timeout in seconds

   Answer: B

   Explanation: Cisco defines this parameter as "The interface or IP address of the router to use as a source address for the probes." Selecting the LAN address makes replies target that source; size, count, and timeout do not change the return destination.

   Reference: Understand the Extended Ping and Extended Traceroute Commands — Extended Ping — Source address or interface

5. 5AAA is enabled on a Cisco IOS router, and local user accounts already exist. Which default login method list authenticates users against that local username database?

   1. A. `aaa authentication login default enable`
   2. B. `aaa authentication login default line`
   3. C. `aaa authentication login default local`
   4. D. `aaa authentication login default none`

   Answer: C

   Explanation: Cisco says the local keyword selects "the local username database for authentication." Enable uses the enable password, line uses the line password, and none permits authentication without checking a database.

   Reference: Configuring Authentication — Login Authentication Using the Local Password

6. 6What does this Python 3 script print? ```python total = 0 for value in [2, 5, 8]: total = total + value print(total) ```

   1. A. 3
   2. B. 8
   3. C. 10
   4. D. 15

   Answer: D

   Explanation: The Python tutorial states that for "iterates over the items of any sequence" in their sequence order. The three iterations add 2, 5, and 8 to the initial zero, leaving total equal to 15.

   Reference: The Python Tutorial — More Control Flow Tools — Section 4.2 — for Statements

7. 7Which hierarchical campus layer connects separate distribution blocks in a large LAN?

   1. A. Access switches
   2. B. Distribution switches
   3. C. Core switches
   4. D. WAN edge routers

   Answer: C

   Explanation: Cisco states: "Core layer—Provides connectivity between distribution layers for large LAN environments". Access attaches endpoints, distribution aggregates access, and WAN edge routers connect to WAN services; the core interconnects the distribution blocks.

   Reference: Campus LAN and Wireless LAN Solution Design Guide — Design Fundamentals: Campus Wired LAN — Hierarchical design model

8. 8How is the operating system packaged in a virtual machine?

   1. A. Each VM contains its own guest operating system
   2. B. Every VM must share a single guest kernel with all other VMs
   3. C. A VM contains applications but cannot contain an operating system
   4. D. A VM's operating system must be identical to the host management OS

   Answer: A

   Explanation: Red Hat states: "VMs contain their own operating system (OS)". A VM is not merely an application process sharing a required common guest kernel; multiple different guest operating systems can coexist.

   Reference: What is a hypervisor? — Containers vs. VMs

9. 9VLAN 30 exists and is active on both switches. Their 802.1Q trunk is up, but its allowed list is `10,20` on both ends. STP is forwarding for the relevant path. Which change restores VLAN 30 across this link without removing the existing VLANs?

   1. A. Change the trunk native VLAN to 30 only
   2. B. Set the access VLAN to 30 on each trunk port
   3. C. Add VLAN 30 to the allowed list at both ends
   4. D. Remove VLAN 30 from the pruning-eligible list only

   Answer: C

   Explanation: Cisco explains that removing a VLAN from the allowed list prevents "traffic from those VLANs from passing over the trunk." VLAN 30 must be allowed at both ends; changing native/access VLAN settings or pruning eligibility does not correct the stated allowed list.

   Reference: Configuring VLAN Trunks — Information About VLAN Trunks — Allowed VLANs on a Trunk

10. 10An IOS traceroute displays an asterisk for one probe. What does that symbol establish about the probe?

    1. A. The destination has accepted a TCP connection
    2. B. A routing loop has been positively identified
    3. C. The local egress interface is administratively down
    4. D. No response arrived before the probe timer expired

    Answer: D

    Explanation: Cisco states: "If the timer goes off before a response comes in, trace prints an asterisk(*)". The symbol alone does not prove a routing loop, a local shutdown, or successful destination delivery.

    Reference: Understand the Extended Ping and Extended Traceroute Commands — Extended Traceroute — response interpretation