7 07 2017

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QUESTION 76
Which two network topologies are the most popular in switching? (Choose two.)

A.    Bus
B.    Token passing bus
C.    Star
D.    Extended star
E.    Ring

Answer: CD
Explanation:
http://en.wikipedia.org/wiki/Network_topology

QUESTION 77
Which two VTP modes allow the creation of local VLANs? (Choose two.)

A.    transparent
B.    native
C.    server
D.    client
E.    on

Answer: AC

QUESTION 78
Which three terms are used to describe data at Layers 1, 2, and 4 of the OSI model? (Choose three.)

A.    PDUs
B.    Bits
C.    Sequences
D.    Segments
E.    Packets
F.    Frames

Answer: BDF
Explanation:
Bits -1 layer
Frames – 2 layer
Segments – 4 layer
http://en.wikipedia.org/wiki/OSI_model

QUESTION 79
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.

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 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 80
Which device would you select to partition a network into VLANs?

A.    repeater
B.    bridge
C.    switch
D.    router
E.    hub

Answer: C

QUESTION 81
On which two components of a router can a copy of a running-configuration file be saved manually by an engineer for backup purposes? (Choose two.)

A.    NVRAM
B.    Flash
C.    ROM
D.    RAM
E.    DRAM

Answer: AB

QUESTION 82
Which VTP mode disallows the creation of local VLANs?

A.    transparent
B.    tunneling
C.    server
D.    client
E.    off
F.    native

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/c onfiguration/guide/swvtp.html#wp1205076

QUESTION 83
Which layer of the OSI model is associated with the reliable transmission of datagrams?

A.    Datagram
B.    Routing
C.    Network
D.    Data link
E.    Transport
F.    Transmission
G.    Session

Answer: E
Explanation:
http://en.wikipedia.org/wiki/Transport_layer

QUESTION 84
Which three options describe routers compared to switches? (Choose three.)

A.    use IP address tables for information lookup
B.    concerned with packet forwarding
C.    operate at Layer 3 of the OSI model
D.    operate at Layer 2 of the OSI model
E.    use MAC address tables for information lookup
F.    concerned with the local delivery of frames

Answer: ABC

QUESTION 85
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.

Answer: BCDF

QUESTION 86
At which layer of the OSI model does TCP operate?

A.    1
B.    2
C.    3
D.    4
E.    5

Answer: D
Explanation:
http://en.wikipedia.org/wiki/OSI_model

QUESTION 87
Which two layers of the OSI model are combined in the Internet protocol suite network access layer? (Choose two.)

A.    1
B.    2
C.    3
D.    4
E.    5
F.    6
G.    7

Answer: AB
Explanation:
http://en.wikipedia.org/wiki/Internet_protocol_suite

QUESTION 88
A switch is configured to be part of a VTP domain so that its VLAN database is not affected by any changes in the domain. Which mode should be configured on this switch?

A.    client
B.    transparent
C.    server
D.    neutral

Answer: B

QUESTION 89
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

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-switch-works/
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