CCNA Data Center: 12-Question Practice Exam

CCNA Data Center, like eight other certifications, will retire in February 2020. If you're already working toward your CCNA Data Center, then keep working toward your goal. There's still time. When you pass both exams — 200-150 DCICN and 200-155 DCICT — you'll receive the new CCNA, and then you can start working on one of the new CCNPs.

In the meantime, answer these 12 questions to get a feel for the questions you may see on the 200-150 DCICN exam. Good luck!

1. In the TCP/IP model of the DoD, what layer represents the top three layers of the OSI model?

1. Network

2. Transport

3. Internet

4. Application

Correct Answer: d

Explanation: In the DoD TCP/IP model, the top layer is application. It represents the layers of Application, Presentation, and Session layers of the OSI model.

2. What is the destination MAC address of the ARP request a workstation makes on the network?

1. A unicast

2. A multicast

3. A broadcast

4. An anycast

Explanation: The initial ARP request is a broadcast frame. As a result, the MAC address is the broadcast address.

3. What is the well-known port assigned to an unsecured Web server?

1. 80

2. 21

3. 443

4. 23

Explanation: TCP port 80 is the well-known port for HTTP (Web). The secured HTTPS port is 443.

4. What layer seeks to consolidate the traffic that is incoming and outgoing from the Access Layer?

1. Core Layer

2. Distribution Layer

3. Access Layer

4. Server Layer

Explanation: The Distribution Layer is often made up of Layer 3 switches. It is where intense processing of data traffic occurs. It aggregates the traffic of the Access Layer.

5. What technology eliminates the need to distinguish a crossover cable from a straight-through Ethernet cable?

1. STP

2. VTP

3. MDIX

4. ARP

Explanation: MDIX can autodetect the cable type in use and adapt the switch to use this cable.

6. What is a typical speed for a modern Cisco switch uplink in the Data Center?

1. 1 Gbps

2. 100 Mbps

3. 10 Gbps

4. 5 Gbps

Explanation: Typically, 1 Gbps ports exist on the switch for user connections, and the uplink is 10 Gbps.

7. How many collision domains and broadcast domains were on an early hub?

1. 1 Collision Domain; 1 Broadcast Domain per port

2. 1 Broadcast Domain; 1 Collision Domain per port

3. 1 Broadcast Domain; 0 Collision Domains

4. 1 Broadcast Domain; 1 Collision Domain

Explanation: Early hubs did not have the ability to create additional collision domains. This was the role of the switch with a collision domain per port. This is sometimes called microsegmentation of the network.

8. What type of device is often known for its use of software-based switching capabilities?

1. Firewall

2. Hub

3. Bridge

4. Router

Explanation: A bridge uses a software-based switching approach in its operation.

9. Where is the OS stored on a switch when the device is not in use?

1. ASIC

2. Flash

3. RAM

4. NVRAM

Explanation: The Flash memory on a switch acts like a hard drive for the device. The OS resides there. When the switch is in operation, the OS is often copied into memory.

10. Which statement about a MAC address is false?

1. There is a network portion and a host portion in the address

2. It is often presented differently on different operating systems

3. It consists of 12 hex characters

4. Many network devices have one "burned in"

Explanation: There is a vendor and host portion of a MAC address- not a network and host portion.

11. What is the term for a bundle of Ethernet ports that you use to increase bandwidth and improve resiliency?

1. EtherChannel

2. RSTP

3. Fabric Path

4. TRILL

Explanation: A port channel or link aggregation group using Ethernet is termed an EtherChannel.

12. What does a switch do by default when it receives a frame that is addressed for an unknown MAC destination?

1. It floods the frame out every port

2. It floods the frame out every port of that VLAN except the receiving port

3. It drops the frame

4. It buffers the frame behind known unicast transmissions

Explanation: If the switch does not know the destination MAC address, it will flood it out all the ports for that VLAN. Note that it does not flood it out the port it received the frame on.