CCNA Practice Questions

Which subnet mask would make room for 20 hosts.

255.255.255.224

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

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

Which statement explains this error message? "Bad mask /28 for address 192.168.16.143"

It is a broadcast IP address

TFTP

Port 69 Does not require user authentication. Uses UDP

How do TCP and UDP differ in the way they guarantee packet delivery?

TCP uses checksum, acknowledgements, and retransmissions, and UDP uses checksums only.

What are two descriptions of three-tier networks topologies?

The distribution layer runs Layer 2 and Layer 3 technologies. The network core is designed to maintain continuous connectivity when devices fail.

Which statement identifies the functionality of virtual machines?

The hypervisor can virtualize physical components including CPU, memory, and storage

UDP

Transmissions include an 8-byte header Transmits packets as a stream Uses a higher transmission rate to support latency-sensitive applications

TCP

Sends transmissions in sequence Transmits packets individually Uses a lower transmission rate to ensure reliability

Which network allows devices to communicate without the need to access the internet?

172.28.0.0/16

A wireless administrator has configured a WLAN, however, the clients need access to a less congested 5-Ghz network for their voice quality. What action must be taken to meet the requirement?

enable Band Select

Which action must be taken to assign a global unicast IPV6 address on an interface that is derived from the MAC address of that interface?

enable SLAAC on an interface

An engineer must configure a /30 subnet between two routes. Which usable IP address and subnet mask combination meets this criteria?

interface e0/0 description to XX-AXXX-XXXXX ip address 209.166.201.2 255.255.255.252

Which 802.11 frame type is association response?

management

What are two reasons that cause late collisions to increment on an ethernet interface?

When carrier sense multiple access/collision detection is used when the cable length limits are exceeded

Which command automatically generates an IPV6 address from a specific IPV6 prefix and MAC address of an interface?

ipv6 address autoconfig

Which IPV6 address type provides communication between subnets and cannot route on the internet?

unique local

Which function does the range of private IPV4 addresses perform?

Allows multiple companies to each use the same addresses without conflicts

Several new coverage cells are required to improve the Wi-Fi network of an organization. Which two standard designs are recommended? (Choose two.)

Calls that overlap one another are configured to use nonoverlapping channels. For maximum throughput, the WLC is configured to dynamically set adjacent access points to the channel.

What is a characteristic of spine-and-leaf architecture?

Each device is separated by the same number of hops.

Which IPV6 address block forwards packets to a multicast address rather than a unicast address?

FF00::/12

Which IPV6 address block sends packets to a group address rather than a single address?

FF00::/8

When configuring IPV6 on an interface, which two IPV6 multicast groups are joined?

FF02::1 FF02::2

What occurs to frames during the process of frame flooding?

Frames are sent to every port on the switch in the same VLAN except from the originating port.

Which action is taken by switch port enabled for PoE power classification override?

If a monitored port exceeds the maximum administrative value for power, the port is shut down and err-disabled

What is a benefit of using a Cisco Wireless LAN Controller?

It eliminates the need to configure each access point individually

A device detects two stations transmitting frames at the same time. This condition occurs after the first 64 bytes of the frame is received. Which interface counter increments?

Late collision

FTP

Ports 20 and 21 Provides reliability when loading an IOS image upon boot up. Uses TCP

What is the difference regarding reliability and communication type between TCP and UDP?

TCP is reliable and is a connection-oriented protocol; UDP is not reliable and is a connectionless protocol.

How do TCP and UDP differ in the way they provide reliability for delivery of packets?

TCP provides flow control to avoid overwhelming a receiver by sending too many packets at once, UDP sends packets to the receiver in a continuous stream without checking.

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

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

How does CAPWAP communicate between an access point in local mode and a WLC?

The access point has the ability to link to any switch in the network, assuming connectivity to the WLC.

What are two differences between optical-fiber cabling and copper cabling?

The glass core component is encased in cladding. Light is transmitted through the core of the fiber.

What is the default behavior of a layer 2 switch when a frame with an unknown destination MAC address is received?

The layer 2 switch floods packets to all ports except the receiving port in the given VLAN

What is the expected outcome when an EUI-64 address is generated?

The seventh bit of the original MAC address of the interface is inverted.

Which type of IPV6 address is publicly routable in the same way as IPV4 public addresses?

global unicast

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

input errors CRC

An office has 8 floors with approximately 30-40 users per floor .What command must be configured on the router Switched Virtual Interface to use address space efficiently?

ip address 192.168.0.0 255.255.255.128

Using direct sequence spread spectrum, which three 2-4 Ghz channels are used to limit collisions.

1, 6, 11

A corporate office uses four floors in a building Floor 1 has 24 users Floor 2 has 29 users Floor 3 has 28 users Floor 4 has 22 users Which subnet summarizes and gives the most efficient distribution of IP addresses for the router configuration?

192.168.0.0/25 as summary and 192.168.0.0/27 for each floor