Cisco CCNA 200-301 Questions & Answers

• Question 1301:

  A frame that enters a switch fails the Frame Check Sequence. Which two interface counters are incremented? (Choose two.)

  A. input errors

  B. frame

  C. giants

  D. CRC

  E. runts

  Correct Answer: AD

  Whenever the physical transmission has problems, the receiving device might receive a frame whose bits have changed values. These frames do not pass the error detection logic as implemented in the FCS field in the Ethernet trailer. The

  receiving device discards the frame and counts it as some kind of input error. Cisco switches list this error as a CRC error. Cyclic redundancy check (CRC) is a term related to how the FCS math detects an error.

  The “input errors” includes runts, giants, no buffer, CRC, frame, overrun, and ignored counts.

  The output below show the interface counters with the “show interface s0/0/0” command:

  

• Question 1302:

  Which command automatically generates an IPv6 address from a specified IPv6 prefix and MAC address of an interface?

  A. ipv6 address dhcp

  B. ipv6 address 2001:DB8:5:112::/64 eui-64

  C. ipv6 address autoconfig

  D. ipv6 address 2001:DB8:5:112::2/64 link-local

  Correct Answer: B

  The command "ipv6 address 2001:DB8:5:112::/64 eui-64" automatically generates an IPv6 address from a specified IPv6 prefix and MAC address of an interface using the EUI-64 method. The EUI-64 method uses the MAC address of the

  interface to create an interface identifier (IID) that is used to complete the IPv6 address.

  Option A ("ipv6 address dhcp") configures an interface to obtain an IPv6 address through DHCPv6.

  Option C ("ipv6 address autoconfig") configures an interface to automatically obtain an IPv6 address using Stateless Address Autoconfiguration (SLAAC).

  Option D ("ipv6 address 2001:DB8:5:112::2/64 link-local") configures an IPv6 link-local address on the interface.

  The EUI-64 method uses the MAC (Media Access Control) address of the network interface to generate a unique 64-bit identifier. The MAC address is a unique identifier assigned to the network interface by the manufacturer and is usually 48

  bits long. The EUI-64 method takes the MAC address and adds a 16-bit value to create a 64-bit identifier.

• Question 1303:

  Which statement identifies the functionality of virtual machines?

  A. The hypervisor communicates on Layer 3 without the need for additional resources.

  B. Each hypervisor can support a single virtual machine and a single software switch.

  C. The hypervisor virtualizes physical components including CPU, memory, and storage.

  D. Virtualized servers run most efficiently when they are physically connected to a switch that is separate from the hypervisor.

  Correct Answer: C

  The hypervisor virtualizes physical components including CPU, memory, and storage. The hypervisor is a software layer that sits between the physical hardware of a computer and the operating system. It virtualizes physical components such as CPU, memory, and storage, allowing for multiple operating systems to run on a single physical machine. This allows for improved scalability, flexibility, and resource utilization.

• Question 1304:

  In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?

  A. A spine switch and a leaf switch can be added with redundant connections between them.

  B. A spine switch can be added with at least 40 GB uplinks.

  C. A leaf switch can be added with connections to every spine switch.

  D. A leaf switch can be added with a single connection to a core spine switch.

  Correct Answer: C

  Spine-leaf architecture is typically deployed as two layers: spines (such as an aggregation layer), and leaves (such as an access layer). Spine-leaf topologies provide high-bandwidth, low-latency, nonblocking server-to-server connectivity.

  Leaf (aggregation) switches are what provide devices access to the fabric (the network of spine and leaf switches) and are typically deployed at the top of the rack. Generally, devices connect to the leaf switches.

  Devices can include servers, Layer 4-7 services (firewalls and load balancers), and WAN or Internet routers. Leaf switches do not connect to other leaf switches. In spine-and-leaf architecture, every leaf should connect to every spine in a full

  mesh.

  Spine (aggregation) switches are used to connect to all leaf switches and are typically deployed at the end or middle of the row. Spine switches do not connect to other spine switches.

• Question 1305:

  Refer to the exhibit.

  

  Which type of route does R1 use to reach host 10.10.13.10/32?

  A. default route

  B. network route

  C. host route

  D. floating static route

  Correct Answer: B

  By process of elimination, the answer must be B, although I think the PC diagram with the /25 might be confusing some people.

  The default route given is 10.10.10.18 for any traffic not matching a known route and the host 10.10.13.10/32 is known, therefore it cannot be A.

  It cannot be C because there are no /32, single hosts in the table

  It cannot be D because a floating static route is used for higher administrative distances are none are present in this scenario.

• Question 1306:

  Which 802.11 frame type is association response?

  A. management

  B. protected frame

  C. action

  D. control

  Correct Answer: A

  Reference: https://en.wikipedia.org/wiki/802.11_Frame_Types

• Question 1307:

  How do TCP and UDP differ in the way that they establish a connection between two endpoints?

  A. TCP uses the three-way handshake, and UDP does not guarantee message delivery.

  B. TCP uses synchronization packets, and UDP uses acknowledgement packets.

  C. UDP provides reliable message transfer, and TCP is a connectionless protocol.

  D. UDP uses SYN, SYN ACK, and FIN bits in the frame header while TCP uses SYN, SYN ACK, and ACK bits.

  Correct Answer: A

• Question 1308:

  What is the root port in STP?

  A. It is the port with the highest priority toward the root bridge.

  B. It is the port on the root switch that leads to the designated port on another switch.

  C. It is the port that is elected only when the root bridge has precisely one port on a single LAN segment.

  D. It is the port on a switch with the lowest cost to reach the root bridge.

  Correct Answer: D

• Question 1309:

  When a switch receives a frame from an unknown source MAC address, which action does the switch take with the frame?

  A. It sends the frame to ports within the CAM table identified with an unknown source MAC address.

  B. It floods the frame out all interfaces, including the interface it was received on.

  C. It associates the source MAC address with the LAN port on which it was received and saves it to the MAC address table.

  D. It attempts to send the frame back to the source to ensure that the source MAC address is still available for transmissions.

  Correct Answer: C

• Question 1310:

  When the LAG configuration is updated on a Cisco WLC, which additional task must be performed when changes are complete?

  A. Reboot the WLC.

  B. Flush all MAC addresses from the WLC.

  C. Re-enable the WLC interfaces.

  D. Re-associate the WLC with the access point.

  Correct Answer: A

  When you enable LAG or make any changes to the LAG configuration, you must immediately reboot the controller.