Vendor Name: Cisco
Exam code: 100-101
Exam Name: CCNA Interconnecting Cisco Networking Devices 1
Click the link below to get full version
http://www.certifyguide.com/exam/100-101/
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Question: 1
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Which three
statements are true about the operation of a full-duplex Ethernet network?
(Choose three.)
A. There
are no collisions in full-duplex mode.
B. A
dedicated switch port is required for each full-duplex node.
C. Ethernet
hub ports are preconfigured for full-duplex mode.
D. In a
full-duplex environment, the host network card must check for the availability
of the network media before transmitting.
E. The host
network card and the switch port must be capable of operating in full-duplex
mode.
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Answer: A, B, E
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Explanation:
Half-duplex
Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use
one wire pair with a digital signal running in both directions on the wire. It
also uses the CSMA/CD protocol to help prevent collisions and to permit
retransmitting if a collision does occur. If a hub is attached to a switch, it
must operate in half-duplex mode because the end stations must be able to
detect collisions. Half-duplex Ethernet—typically 10BaseT—is only about 30 to
40 percent efficient as Cisco sees it, because a large 10BaseT network will
usually only give you 3- to 4Mbps—at most.
Full-duplex
Ethernet uses two pairs of wires, instead of one wire pair like half duplex.
Also, full duplex uses a point-to-point connection between the transmitter of
the transmitting device and the receiver of the receiving device, which means
that with full-duplex data transfer, you get a faster data transfer compared to
half duplex. And because the transmitted data is sent on a different set of
wires than the received data, no collisions occur. The reason you don’t need to worry about
collisions is because now Full-duplex Ethernet is like a freeway with multiple
lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent
efficiency in both directions; this means you can get 20Mbps with a 10Mbps
Ethernet running full duplex, or 200Mbps for FastEthernet.
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Question: 2
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DRAG DROP
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Answer:
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Question: 3
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Which OSI
layer header contains the address of a destination host that is on another
network?
A.
application
B. session
C.
transport
D. network
E. data
link
F. physical
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Answer: D
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Explanation:
Only
network address contains this information. To transmit the packets the sender
uses network address and datalink address. But the layer 2 address represents
just the address of the next hop device on the way to the sender. It is changed
on each hop. Network address remains the same.
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Question: 4
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Which layer
of the TCP/IP stack combines the OSI model physical and data link layers?
A. Internet
layer
B.
transport layer
C.
application layer
D. network
access layer
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Answer: D
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Explanation:
The
Internet Protocol Suite, TCP/IP, is a suite of protocols used for communication
over the internet. The TCP/IP model was
created after the OSI 7 layer model for two major reasons. First, the foundation of the Internet was
built using the TCP/IP suite and through the spread of the World Wide Web and
Internet, TCP/IP has been preferred.
Second, a project researched by the Department of Defense (DOD)
consisted of creating the TCP/IP protocols.
The DOD's goal was to bring international standards which could not be
met by the OSI model. Since the DOD was the largest software consumer and they
preferred the TCP/IP suite, most vendors used this model rather then the
OSI. Below is a side by side comparison
of the TCP/IP and OSI models.
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TCP/IP
Model
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VS.
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OSI Model
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Application
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Layer 7
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Application
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Layer 6
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Presentation
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Layer 5
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Session
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Transport
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Layer 4
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Transport
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Internet
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Layer 3
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Network
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Network
Access
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Layer 2
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Data Link
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Layer 1
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Physical
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Question: 5
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Which
protocol uses a connection-oriented service to deliver files between end
systems?
A. TFTP
B. DNS
C. FTP
D. SNMP
E. RIP
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Answer: C
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Explanation:
FTP is an
acronym for File Transfer Protocol. As the name suggests, FTP is used to
transfer files between computers on a network. You can use FTP to exchange
files between computer accounts, transfer files between an account and a
desktop computer, or access online software archives
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Question: 6
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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
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Answer: C
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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.
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Question: 7
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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
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Answer: E
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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 router’s interface address. Similarly, the
destination IP address always remains the same and the destination physical
(MAC) address is the destination router’s interface address.
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Question: 8
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Refer to
the exhibit.
HostX is
transferring a file to the FTP server. Point A represents the frame as it goes
toward the Toronto router. What will the Layer 2 destination address be at this
point?
A.
abcd.1123.0045
B.
192.168.7.17
C.
aabb.5555.2222
D.
192.168.1.1
E.
abcd.2246.0035
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Answer: E
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Explanation:
For packets
destined to a host on another IP network, the destination MAC address will be
the LAN interface of the router. Since the FTP server lies on a different
network, the host will know to send the frame to its default gateway, which is
Toronto.
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Question: 9
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Which network
device functions only at Layer 1 of the OSI model?
A.
B.
C.
D.
E.
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Answer: B
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Explanation:
Most hubs
are amplifying the electrical signal; therefore, they are really repeaters with
several ports. Hubs and repeaters are Layer 1 (physical layer) devices.
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Question: 10
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Refer to
the exhibit.
The host in
Kiev sends a request for an HTML document to the server in Minsk. What will be
the source IP address of the packet as it leaves the Kiev router?
A. 10.1.0.1
B. 10.1.0.5
C. 10.1.0.6
D.
10.1.0.14
E.
10.1.1.16
F. 10.1.2.8
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Answer: E
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Although
the source and destination MAC address will change as a packet traverses a
network, the source and destination IP address will not unless network address translation
(NAT) is being done, which is not the case here.
Vendor Name: Cisco
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