CCNA Mock Quiz - Network Fundamentals

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

• UDP uses SYN, SYN ACK, and FIN bits in the frame header while TCP uses SYN, SYN ACK, and ACK bits.
• UDP provides reliable message transfer, and TCP is a connectionless protocol.
• TCP uses the three-way handshake, and UDP does not guarantee message delivery.
• TCP uses synchronization packets, and UDP uses acknowledgement packets.

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

• Giants
• Input errors
• Runts
• CRC
• Frame

What are the two reasons that cause late collisions to increment on an Ethernet interface? (Choose two)

• When the cable length limits are exceeded
• When a collision occurs after the 32nd byte of a frame has been transmitted
• When the sending device waits 15 seconds before sending the frame again
• When Carrier Sense Multiple Access/Collision Detection is used
• When one side of the connection is configured for half-duplex

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

• If a monitored port exceeds the maximum administrative value for power, the port is shutdown and err-disabled.
• As power usage on a PoE switch port is checked , data flow to the connected device is temporarily paused.
• When a powered device begins drawing power from a PoE switch port, a syslog message is generated.
• If a switch determines that a device using less than the minimum configured power it assumes the device has failed and disconnects it.

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 sends a copy of a packet to CPU for destination MAC address learning.
• The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN.
• The Layer 2 switch forwards the packet and adds the destination MAC address to its MAC address table.
• The Layer 2 switch drops the received frame.

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.
• A leaf switch can be added with a single connection to a core spine switch.
• A spine switch can be added with at least 40 GB uplink.
• A spine switch and a leaf switch cam be added with redundant connections between them.

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

• ipv6 address 2001:db8:5:112::/64 eui-64
• ipv6 address 2001:db8:5:112::2/64 link-local
• ipv6 address autoconfig
• ipv6 address dhcp

When configuring IPv6 on an interface, which two IPv6 multicast group are joined? (Choose two)

• 2000::/3
• 2002::5
• FC00::/7
• FF02::1
• FF02::2

Which IPv6 address block send packets to a group address rather than a single address?

• 2000::/3
• FC00::/7
• FE80::/10
• FF00::/8
• FF00::/16

Which IPv6 address type provides communication between subnets and cannot route on the internet?

• Link-local
• Global unicast
• Multicast
• Unique local