Cisco CCNA 200-301 Questions & Answers

• Question 821:

  Which port type supports the spanning-tree portfast command without additional configuration?

  A. access ports

  B. Layer 3 main Interfaces

  C. Layer 3 suninterfaces

  D. trunk ports

  Correct Answer: A

• Question 822:

  Which communication interaction takes place when a southbound API Is used?

  A. between the SDN controller and PCs on the network

  B. between the SON controller and switches and routers on the network

  C. between the SON controller and services and applications on the network

  D. between network applications and switches and routers on the network

  Correct Answer: B

  The communication interaction that takes place when a southbound API is used is B. between the SDN controller and switches and routers on the network.

  In a software-defined networking (SDN) architecture, the control plane is centralized in an SDN controller, which manages and controls the behavior of network devices such as switches and routers. The southbound API is the interface

  through which the SDN controller communicates with these network devices.

  When using the southbound API, the SDN controller sends instructions and configuration commands to the switches and routers in the network. These instructions can include actions like modifying forwarding tables, setting up flow rules,

  configuring quality of service (QoS) parameters, and more.

  The switches and routers, acting as the data plane, receive and process the instructions from the controller, implementing the desired network behavior. They forward traffic based on the rules and configurations received from the controller.

• Question 823:

  Which two characteristics describe the access layer in a three-tier network architecture? (Choose two.)

  A. serves as the network aggregation point

  B. physical connection point for a LAN printer

  C. designed to meet continuous redundant uptime requirements

  D. layer at which a wireless access point connects to the wired network

  E. provides a boundary between Layer 2 and Layer 3 communications

  Correct Answer: BD

  This question is asking for the characteristics for the access layer not the distribution.

• Question 824:

  Refer to the exhibit.

  

  Which change to the configuration on Switch allows the two switches to establish an GtherChannel?

  A. Change the protocol to EtherChannel mode on.

  B. Change the LACP mode to active

  C. Change the LACP mode to desirable

  D. Change the protocol to PAqP and use auto mode

  Correct Answer: B

• Question 825:

  What prevents a workstation from receiving a DHCP address?

  A. DTP

  B. STP

  C. VTP

  D. 802.10

  Correct Answer: B

  The time it takes to get to the Forwarding state might be too long for a client's DHCP process (which starts after the interface on the client becomes 'up'). Using Spanning-Tree PortFast can mitigate this exact issue. So yes, STP can prevent workstations from getting an IP-adress using DHCP.

• Question 826:

  What Is a syslog facility?

  A. Host that is configured for the system to send log messages

  B. password that authenticates a Network Management System to receive log messages

  C. group of log messages associated with the configured severity level

  D. set of values that represent the processes that can generate a log message

  Correct Answer: C

  A syslog facility is a group of log messages that are associated with a particular configured severity level. Syslog facilities are used to categorize log messages so that they can be filtered and managed more easily. The severity level of a log

  message determines how important the message is and how it should be handled.

  Option A is incorrect because it describes a syslog host, which is a device that is configured to receive and store syslog messages from other devices.

  Option B is incorrect because it describes a password used to authenticate a Network Management System (NMS) to receive log messages, which is not related to syslog facilities.

  Option D is incorrect because it describes the syslog process, which is a set of values that represent the processes that can generate a log message, but it is not the same as a syslog facility.

• Question 827:

  Which function is performed by DHCP snooping?

  A. propagates VLAN information between switches

  B. listens to multicast traffic for packet forwarding

  C. provides DDoS mitigation

  D. rate-limits certain traffic

  Correct Answer: D

  Use the following steps to enable DHCP snooping:

  Step 1. Enable DHCP snooping by using the "ip dhcp snooping" global configuration command.

  Step 2. On trusted ports, use the "ip dhcp snooping trust" interface configuration command.

  Step 3. Limit the number of DHCP discovery messages that can be received per second on untrusted ports by using the "ip dhcp snooping limit rate (rate in secs)" interface configuration command.

  Step 4. Enable DHCP snooping by VLAN, or by a range of VLANs, by using the "ip dhcp snooping vlan (vlan or vlan range)" global configuration command.

• Question 828:

  Which plane is centralized by an SON controller?

  A. management-plane

  B. control-plane

  C. data-plane

  D. services-plane

  Correct Answer: B

• Question 829:

  Which access layer threat-mitigation technique provides security based on identity?

  A. Dynamic ARP Inspection

  B. using a non-default native VLAN

  C. 802.1x

  D. DHCP snooping

  Correct Answer: C

  https://alexwilkins.dev/index.php/1-7-describe-common-access-layer-threat-mitigation-techniques/

• Question 830:

  What are two similarities between UTP Cat 5e and Cat 6a cabling? (Choose two.)

  A. Both operate at a frequency of 500 MHz.

  B. Both support runs of up to 55 meters.

  C. Both support runs of up to 100 meters.

  D. Both support speeds of at least 1 Gigabit.

  E. Both support speeds up to 10 Gigabit.

  Correct Answer: CD

  Cat5:

  Frequency: Up to 100 MHz

  Bandwidth: 100 Mbps (Fast Ethernet)

  Max Distance: 100 meters (328 feet)

  Cat5e:

  Frequency: Up to 100 MHz

  Bandwidth: 1 Gbps (Gigabit Ethernet)

  Max Distance: 100 meters (328 feet)

  Cat6:

  Frequency: Up to 250 MHz

  Bandwidth: 10 Gbps (10 Gigabit Ethernet)

  Max Distance: 55 meters (180 feet) for 10 Gbps, 100 meters (328 feet) for 1 Gbps

  Cat6a:

  Frequency: Up to 500 MHz

  Bandwidth: 10 Gbps (10 Gigabit Ethernet)

  Max Distance: 100 meters (328 feet)

  Cat7:

  Frequency: Up to 600 MHz

  Bandwidth: 10 Gbps (10 Gigabit Ethernet)

  Max Distance: 100 meters (328 feet)

  Cat8:

  Frequency: Up to 2 GHz

  Bandwidth: 25/40 Gbps (25/40 Gigabit Ethernet)

  Max Distance: 30 meters (98 feet)