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2016 NEW Cisco 640-911: Introducing
Cisco Data Center Networking (DCICN)
Exam Questions and Answers
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QUESTION 1
What are two features of a bridge? (Choose two.)
A.
B.
C.
D.
E.
F.
G.

reliable transmission
operate at OSI Layer 2
operate at OSI Layer 3
create multiple broadcast domains
create multiple collision domains
flood input packets to all ports
drop IP packets with invalid destination ports

Answer: BE
Explanation:
"- a bridge is a two interfaces device that creates 2 collision domains, since it forwards the traffic
it receives from one interface only to the interface where the destination layer 2 device (based on
his mac address) is connected to. A bridge is considered as an "intelligent hub" since it reads the
destination mac address in order to forward the traffic only to the interface where it is connected"
https://learningnetwork.cisco.com/thread/1734
QUESTION 2
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.

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D. Larger inspection engine allows for higher throughput.
E. Switches have many ports.
Answer: BCE
Explanation:
http://docwiki.cisco.com/wiki/Bridging_and_Switching_Basics
QUESTION 3
What action does a switch take if the destination MAC address is unknown?
A.
B.
C.
D.
E.

discard frame
send ICMP unreachable message to source
flood packet on all ports
compare destination IP address against an ACL to determine if it is permitted
send gratuitous ARP on all ports and wait for reply before forwarding

Answer: C
Explanation:
"What happens though when the switch receives a frame with a destination MAC address that is
not included in the table? In that case the switch will just broadcast/flood the frame with the
unknown destination address to all of its ports (apart from the port where the frame came from).
This process is called unknown unicast flooding. "
http://telconotes.wordpress.com/2013/03/09/how-a-s witch-works/
QUESTION 4
Which statement describes the purpose of the MAC address forwarding table of a switch?
A.
B.
C.
D.

The
The
The
The

switch consults
switch consults
switch consults
switch consults

the forwarding
the forwarding
the forwarding
the forwarding

table
table
table
table

to determine
to determine
to determine
to determine

the best route to a destination.
the output port.
if the packet is routable.
if access control permits the packet.

Answer: B
QUESTION 5
What are two attributes of a VLAN? (Choose two.)
A.
B.
C.
D.
E.
F.

A VLAN defines a collision domain.
A VLAN defines a broadcast domain.
Broadcasts are flooded to all VLANs.
Collisions are flooded to all VLANs.
A Layer 3 device is required to route packets between VLANs.
A Layer 2 device is required to route packets between VLANs.

Answer: BE
Explanation:
"In computer networking, a single layer-2 network may be partitioned to create multiple distinct
broadcast domains, which are mutually isolated so that packets can only pass between them via
one or more routers; such a domain is referred to as a virtual local area network, virtual LAN or

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VLAN."
"A router (Layer 3 device) serves as the backbone for network traffic going across different
VLANs."
http://en.wikipedia.org/wiki/Virtual_LAN
QUESTION 6
Which four statements indicate unique properties of VLAN 1 on Cisco Nexus switches? (Choose
four.)
A.
B.
C.
D.
E.
F.

VLAN
VLAN
VLAN
VLAN
VLAN
VLAN

1 is used to flood multicast traffic.
1 cannot be deleted.
1 is used for Cisco Discovery Protocol.
1 is used for VTP advertisements.
1 defines a collision domain.
1 defines a broadcast domain.

Answer: BCDF
Explanation:
http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx os/layer2/configuration/guide/Cisco_Nexus_7000_S eries_NXS_Layer_2_Switching_Configuration_Guide_Release_5.x_chapter4.html
QUESTION 7
Which command displays the Trunking Native Mode VLAN on port Ethernet 1/18?
A.
B.
C.
D.
E.

show
show
show
show
show

running-config switchport e1/18
running-config e1/18 switchport
interface e1/18
interface e1/18 switchport
interface e1/18 native

Answer: D
Explanation:
NX# show interface e1/18 switchport
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Allowed: 1-4094
Voice VLAN: none
QUESTION 8
Which VTP mode disallows the creation of local VLANs?
A.
B.
C.
D.
E.
F.

transparent
tunneling
server
client
off
native

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Answer: D
Explanation:
"A VTP client behaves like a VTP server and transmits and receives VTP updates on its trunks,
but you cannot create, change, or delete VLANs on a VTP client. VLANs are configured on
another switch in the domain that is in server mode."
http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/ 12.2_52_se/configu
ration/guide/swvtp.html#wp1205076
QUESTION 9
Which three statements are true concerning RFC 1918 IP addresses? (Choose three.)
A.
B.
C.
D.
E.
F.

They
They
They
They
They
They

are globally routable.
are not globally routable.
must not be filtered at Internet border interfaces.
should be filtered at Internet border interfaces.
include 10.0.0.0/8, 172.16.0.0/16, and 192.168.1.0/24.
include 10.0.0.0/8, 172.16.0.0/21, and 192.168.0.0/16.

Answer: BDF
Explanation:
"The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the
IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)"
http://tools.ietf.org/html/rfc1918
QUESTION 10
Which two statements describe the purpose of RFC 1918? (Choose two.)
A. Establish a range of IP addresses
B. Establish a range of IP addresses
applications.
C. Establish a range of IP addresses
D. Establish a range of IP addresses
E. Delay the transition to IPv6.

that are dedicated to the growing use of multicast video.
that are dedicated to the growing use of peer-to-peer file-sharing
that are dedicated to use on internal networks.
to address the shrinking pool of globally routable addresses.

Answer: CD
Explanation:
http://tools.ietf.org/html/rfc1918

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