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Cisco
ICND Interconnecting Cisco Networking Devices Part 1
Cisco
ICND Interconnecting Cisco Networking Devices Part 1

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Questions & Answers for Cisco 100-105

Showing 1-15 of 239 Questions

Question #1 - Topic 1

Refer to the exhibit.

The output is from a router in a large enterprise. From the output, determine the role of the
router.

A. A Core router.

B. The HQ Internet gateway router.

C. The WAN router at the central site.

D. Remote stub router at a remote site.

Explanation:
Since the routing table shows only a single default route using the single interface serial
0/0, we know that this is most likely a remote stub site with a single connection to the rest
of the network. All the other answer options would mean that this router would have more
connections, and would contain more routes.

Question #2 - Topic 1

Refer to the exhibit.

A network has been planned as shown. Which three statements accurately describe the
areas and devices in the network plan? (Choose three.)

A. Network Device A is a switch.

B. Network Device B is a switch.

C. Network Device A is a hub.

D. Network Device B is a hub.

E. Area 1 contains a Layer 2 device.

F. Area 2 contains a Layer 2 device.

Explanation:
Switches use a separate collision domain for each port, so device A must be a switch.
Hubs, however, place all ports in the same collision domain so device B is a hub. Switches
reside in layer 2 while hubs are layer 1 devices.

Question #3 - Topic 1

Which two characteristics apply to Layer 2 switches? (Choose two.)

A. Increases the number of collision domains

B. Decreases the number of collision domains

C. Implements VLAN

D. Decreases the number of broadcast domains

E. Uses the IP address to make decisions for forwarding data packets

Explanation:
Layer 2 switches offer a number of benefits to hubs, such as the use of VLANs and each
switch port is in its own separate collision domain, thus eliminating collisions on the
segment.

Question #4 - Topic 1

A workstation has just resolved a browser URL to the IP address of a server. What protocol
will the workstation now use to determine the destination MAC address to be placed into
frames directed toward the server?

A. HTTP

B. DNS

C. DHCP

D. RARP

E. ARP

Explanation:
The RARP protocol is used to translate hardware interface addresses to protocol
addresses. The RARP message format is very similar to the ARP format. When the booting
computer sends the broadcast ARP request, it places its own hardware address in both the
sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill
in the correct sending and receiving IP addresses in its response to the message. This way
the booting computer will know its IP address when it gets the message from the RARP
server

Question #5 - Topic 1

Refer to the exhibit.

If host A sends an IP packet to host B, what will the source physical address be in the
frame when it reaches host B?

A. 10.168.10.99

B. 10.168.11.88

C. A1:A1:A1:A1:A1:A1

D. B2:B2:B2:B2:B2:B2

E. C3:C3:C3:C3:C3:C3

F. D4:D4:D4:D4:D4:D4

Explanation:
When packets transfer from one host to another across a routed segment, the source IP
address always remains the same source IP address, and the source physical (MAC)
address will be the existing routers interface address. Similarly, the destination IP address
always remains the same and the destination physical (MAC) address is the destination
routers interface address.

Question #6 - Topic 1

On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or
from another vendor?

A. RTP

B. TCP

C. CDP

D. UDP

Explanation:
The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN
ID, per port power management details, and Quality of Service (QoS) configuration
information with the Cisco Catalyst switch.
Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help
administrators collect information about both locally attached and remote devices. By using
CDP, you can gather hardware and protocol information about neighbor devices, which is
useful info for troubleshooting the network.
CDP messages are generated every 60 seconds as multicast messages on each of its
active interfaces.
The information shared in a CDP packet about a Cisco device includes the following:
Name of the device configured with the hostname command
IOS software version
Hardware capabilities, such as routing, switching, and/or bridging
Hardware platform, such as 2600, 2950, or 1900
The layer-3 address(es) of the device
The interface the CDP update was generated on
Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-
configuration/cisco-discoveryprotocol.html

Question #7 - Topic 1

Refer to the exhibit.

SwitchA receives the frame with the addressing shown. According to the command output
also shown in the exhibit, how will SwitchA handle this frame?

A. It will drop the frame.

B. It will forward the frame out port Fa0/6 only.

C. It will flood the frame out all ports.

D. It will flood the frame out all ports except Fa0/3.

Explanation:
Switches keep the learned MAC addresses in a table, so that when a frame comes in with
a destination MAC address that the switch has already learned, it will forward it to that port
only. If a frame comes in with a destination MAC that is not already in the MAC address
table, then the frame will be flooded to all ports except for the one that it came in on. In this
case, Switch A already knows that 00b0.d0da.cb56 resides on port fa0/6, so it will forward
the from out that port.

Question #8 - Topic 1

Which two characteristics describe the access layer of the hierarchical network design
model? (Choose two.)

A. layer 3 support

B. port security

C. redundant components

D. VLANs

E. PoE

Explanation:
Access layer
The main purpose of the access layer is to provide direct connection to devices on the
network and controlling which devices are allowed to communicate over it. The access
layer interfaces with end devices, such as PCs, printers, and IP phones, to provide access
to the rest of the network. The access layer can include routers, switches, bridges, hubs,
and wireless access points (AP).
Switch features in the Access layer:
✑ Port security
✑ VLANs
✑ Fast Ethernet/Gigabit Ethernet
✑ Power over Ethernet (PoE)
✑ Link aggregation
✑ Quality of Service (QoS)
References: http://www.ciscopath.com/content/61/
http://www.mcmcse.com/cisco/guides/hierarchical_model.shtml

Question #9 - Topic 1

Refer to the exhibit.

As packets travel from Mary to Robert, which three devices will use the destination MAC
address of the packet to determine a forwarding path? (Choose three.)

A. Hub1

B. Switch1

C. Router1

D. Switch2

E. Router2

F. Switch3

Explanation:
Switches use the destination MAC address information for forwarding traffic, while routers
use the destination IP address information.
Local Area Networks employ Layer 2 Switches and Bridges to forward and filter network
traffic. Switches and Bridges operate at the Data Link Layer of the Open System
Interconnect Model (OSI). Since Switches and Bridges operate at the Layer 2 they operate
more intelligently than hubs, which work at Layer 1 (Physical Layer) of the OSI. Because
the switches and bridges are able to listen to the traffic on the wire to examine the source
and destination MAC address. Being able to listen to the traffic also allows the switches
and bridges to compile a MAC address table to better filter and forward network traffic.
To accomplish the above functions switches and bridges carry out the following tasks:
MAC address learning by a switch or a bridge is accomplished by the same method. The
switch or bridge listens to each device connected to each of its ports and scan the
incoming frame for the source MAC address. This creates a MAC address to port map that
is cataloged in the switches/bridge MAC database. Another name for the MAC address
table is content addressable memory or CAM table.
When a switch or bridge is listening to the network traffic, it receives each frame and
compares it to the MAC address table. By checking the MAC table the switch/ bridge are
able o determine which port the frame came in on. If the frame is on the MAC table the
frame is filtered or transmitted on only that port. If the switch determines that the frame is
not on the MAC table, the frame is forwarded out to all ports except the incoming port.

Question #10 - Topic 1

Refer to the exhibit.

The exhibit is showing the topology and the MAC address table. Host A sends a data frame
to host D. What will the switch do when it receives the frame from host A?

A. The switch will add the source address and port to the MAC address table and forward the frame to host D.

B. The switch will discard the frame and send an error message back to host A.

C. The switch will flood the frame out of all ports except for port Fa0/3.

D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D.

Explanation:
When switch receives the data frame from the host not having the MAC address already on
the MAC table, it will add the MAC address to source port on MAC address table and
sends the data frame.

Question #11 - Topic 1

What are two common TCP applications? (Choose two.)

A. TFTP

B. SMTP

C. SNMP

D. FTP

E. DNS

Explanation:
SMTP uses TCP port 25, while FTP uses TCP ports 20 and 21.
Reference: http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/

Question #12 - Topic 1

Refer to the exhibit.

If the hubs in the graphic were replaced by switches, what would be virtually eliminated?

A. broadcast domains

B. repeater domains

C. Ethernet collisions

D. signal amplification

E. Ethernet broadcasts

Explanation:
Modern wired networks use a network switch to eliminate collisions. By connecting each
device directly to a port on the switch, either each port on a switch becomes its own
collision domain (in the case of half duplex links) or the possibility of collisions is eliminated
entirely in the case of full duplex links.

Question #13 - Topic 1

To what type of port would a cable with a DB-60 connector attach?

A. Serial port

B. Console port

C. Ethernet port

D. Fibre optic port

Explanation:
Serial Connection

cl_3_dte_male

cl_2_dce
The picture on the left shows a V.35 DTE cable with a male DB60 connector and a male
standard 34-pin Winchester-type connector. The right picture shows a V.35 DCE serial
cable with a male DB60 connector and a female 34-pin Winchester-type connector. As you
probably guessed already, the male connector of the DTE cable is attached to the DCE
cable's female connector, this is depicted in the picture below. This is known as a back-to-
back connection, and 'simulates' a WAN link. In a real world setup, the DTE cable's male
connector typically connects to a port on a CSU/DSU provided by a service provider (i.e.
telco), which in turn connects to a CSU/DSU at another location, thru a T1 link for example.
The DB60 connector connects to a Serial interface on a router.

cl_4_malefemale
Reference: http://www.techexams.net/techlabs/ccna/lab_hardware.shtml

Question #14 - Topic 1

Refer to the topology and switching table shown in the graphic.

Host B sends a frame to Host C. What will the switch do with the frame?

A. Drop the frame

B. Send the frame out all ports except port 0/2

C. Return the frame to Host B

D. Send an ARP request for Host C

E. Send an ICMP Host Unreachable message to Host B

F. Record the destination MAC address in the switching table and send the frame directly to Host C

Question #15 - Topic 1

Which statements accurately describe CDP? (Choose three.)

A. CDP is an IEEE standard protocol.

B. CDP is a Cisco proprietary protocol.

C. CDP is a datalink layer protocol.

D. CDP is a network layer protocol.

E. CDP can discover directly connected neighboring Cisco devices.

F. CDP can discover Cisco devices that are not directly connected.

Explanation:
CDP (Cisco Discovery Protocol) is a proprietary protocol designed by Cisco to help
administrators collect information about both locally attached and remote devices. By using
CDP, you can gather hardware and protocol information about neighbor devices containing
useful info for troubleshooting and documenting the network.

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