New Updated Cisco CCNA Data Center 640-911 Real Exam Download 11-20



In an IEEE 802.3 Ethernet frame, what is the significance of the DSAP field?


A.      The DSAP field specifies the TCP or UDP port that is associated with the transport protocol.

B.      The DSAP field is only used on United States Department of Defense networks to indicate the information classification level.

C.      The DSAP field is only used in Ethernet II frames.

D.      The DSAP field indicates the network layer protocol.


Correct Answer: D




Which field in an Ethernet II frame performs the same function as the DSAP field in an 802.3 Ethernet frame?


A.      start of frame

B.      EtherType

C.      frame check sequence

D.      Subnetwork Access Protocol

E.       Logical Link Control


Correct Answer: B




What are two features of a bridge? (Choose two.)


A.      reliable transmission

B.      operate at OSI Layer 2

C.      operate at OSI Layer 3

D.      create multiple broadcast domains

E.       create multiple collision domains

F.       flood input packets to all ports

G.      drop IP packets with invalid destination ports


Correct Answer: BE




What are three reasons that switches supersede bridges? (Choose three.)


A.      Smaller frame buffers decrease latency.

B.      Forward, filter, or flood frames.

C.      Multiple simultaneous communications between ports.

D.      Larger inspection engine allows for higher throughput.

E.       Switches have many ports.


Correct Answer: BCE




What action does a switch take if the destination MAC address is unknown?


A.      discard frame

B.      send ICMP unreachable message to source

C.      flood packet on all ports

D.      compare destination IP address against an ACL to determine if it is permitted

E.       send gratuitous ARP on all ports and wait for reply before forwarding


Correct Answer: C




Which statement describes the purpose of the MAC address forwarding table of a switch?


A.      The switch consults the forwarding table to determine the best route to a destination.

B.      The switch consults the forwarding table to determine the output port.

C.      The switch consults the forwarding table to determine if the packet is routable.

D.      The switch consults the forwarding table to determine if access control permits the packet.


Correct Answer: B




What are two attributes of a VLAN? (Choose two.)


A.      A VLAN defines a collision domain.

B.      A VLAN defines a broadcast domain.

C.      Broadcasts are flooded to all VLANs.

D.      Collisions are flooded to all VLANs.

E.       A Layer 3 device is required to route packets between VLANs.

F.       A Layer 2 device is required to route packets between VLANs.


Correct Answer: BE



Which four statements indicate unique properties of VLAN 1 on Cisco Nexus switches? (Choose four.)


A.      VLAN 1 is used to flood multicast traffic.

B.      VLAN 1 cannot be deleted.

C.      VLAN 1 is used for Cisco Discovery Protocol.

D.      VLAN 1 is used for VTP advertisements.

E.       VLAN 1 defines a collision domain.

F.       VLAN 1 defines a broadcast domain.


Correct Answer: BCDF




Which command displays the Trunking Native Mode VLAN on port Ethernet 1/18?


A.      show running-config switchport e1/18

B.      show running-config e1/18 switchport

C.      show interface e1/18

D.      show interface e1/18 switchport

E.       show interface e1/18 native


Correct Answer: D




Which VTP mode disallows the creation of local VLANs?


A.      transparent

B.      tunneling

C.      server

D.      client

E.       off

F.       native


Correct Answer: D


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