CCNA Last Minute Cram

Question 1

List four types of machine learning (ML).

Answer 1

Reinforcement learning - action/reward
Supervised learning - labeled data set (cats/dogs)
Unsupervised learning - unlabeled data
Deep learning - neural networks

Question 2

True or false: you can use encapsulation dot1q <vlan> native on a router physical interface.</vlan>

Answer 2

false - you’d just configure the IP address on the physical interface, OR specify the native vlan on a subinterface with its own IP address

Question 3

True or false: even though you configure DHCP snooping globally on a switch, you still need to enable it per-VLAN as well.

Answer 3

True

Question 4

What management tools use a procedural approach and what does that mean?

Answer 4

Ansible and Chef. Procedural means step-by-step instructions. Ansible uses YAML, Chef uses a Ruby-based DSL.

Question 5

Which management tools use a declarative approach?

Answer 5

Terraform and Puppet. You tell it your desired end-state, and they make it happen.

Question 6

If two devices have a duplex mismatch, what interface errors would you see on the half-duplex side?

Answer 6

Collisions and late collisions

Question 7

If two devices have a duplex mismatch, what interface errors would you see on the full-duplex side?

Answer 7

CRC errors and runts

Question 8

What is the default OSPF reference bandwidth?

Answer 8

100 Mbps

Question 9

You learned a great mnemonic for syslog alert levels.

Answer 9

Emily Always Calls Eric When Network Is Down

Question 10

True or false: in JSON, anything within curly brackets is an object.

Answer 10

True

Question 11

What are two types of SNMP notifications?

Answer 11

Trap and Inform

Question 12

In addition to the DHCP snooping table, DAI can rely on what other manually-configured method to inspect packets?

Answer 12

ARP ACLs

Question 13

WLAN QoS level Platinum is best suited for…

Answer 13

voice

Question 14

WLAN QoS level Gold is best suited for…

Answer 14

video

Question 15

What WLAN QoS level is “best effort”?

Answer 15

Silver

Question 16

What WLAN QoS level is for “background” traffic?

Answer 16

Bronze

Question 17

Match the following:

NETCONF SSH
RESTCONF HTTP/S

Answer 17

That’s it - NETCONF uses SSH, RESTCONF uses HTTP/S

Question 18

Between RESTCONF and NETCONF, which is stateful and which is stateless?

Answer 18

RESTCONF = stateless; NETCONF = stateful

Question 19

What markup language does NETCONF use?

Answer 19

XML

Question 20

What markup languages does RESTCONF use?

Answer 20

XML and JSON

Question 21

List some facts about Ansible:

• connection protocol?
• markup language?
• push/pull?
• agent usage?

Answer 21

• SSH
• YAML
• Push
• agentless

Question 22

List some facts about Terraform:

• which API does it use?
• agent usage?

Answer 22

• Restconf (XML/JSON)
• agentless

Question 23

What do Chef, Puppet, and Ansible have in common?

Answer 23

They are all configuration tools

Question 24

Why is Terraform different from Chef/Puppet/Ansible?

Answer 24

It is a provisioning tool, not a configuration tool

Question 25

Are Chef and Ansible procedural or declarative?

Answer 25

procedural

Question 26

Are Terraform and Puppet procedural or declarative?

Answer 26

declarative

Question 27

Do Chef and Puppet use agents?

Answer 27

Yes

Question 28

Do Ansible and Terraform use agents?

Answer 28

No

Question 29

True or false: Puppet and Chef use a pull model.

Answer 29

True

Question 30

A VTP server will update its VLAN list if...

Answer 30

the update it receives is of a higher revision number

Question 31

To support extended VLANs, which version of VTP must be running?

Answer 31

version 3

Question 32

What are the two basic commands required to configure DHCP snooping?

Answer 32

ip dhcp snooping ip dhcp snooping vlan (number)

Question 33

What is the command to configure DAI?

Answer 33

(config)# ip arp inspection vlan (number)

Question 34

What are the three SDN architecture layers?

Answer 34

Application, Control, Infrastructure

Question 35

What two components make up the "fabric" in SDN, and in which part of the architecture does the fabric reside?

Answer 35

overlay (virtual network) and underlay (physical network); it resides in the infrastructure layer

Question 36

What is Machine Reasoning Engine (MRE)?

Answer 36

a feature of Catalyst Center which automates network troubleshooting

Question 37

What is AI Endpoint Analytics?

Answer 37

a feature of Catalyst Center which analyzes endpoint behavior with a goal of optimizing security and performance of end devices

Question 38

What is AI Enhanced RRM?

Answer 38

Radio Resource Management, a feature of Catalyst Center which optimizes radio resources

Question 39

SNMP messages from an agent to a manager are sent on port _____, while messages sent from a manager to an agent are sent on port _____.

Answer 39

UDP 162 (trap, inform), UDP 161 (get, set)