Cisco CCNA 1 Chapter 4 Cisco Exam Answers 100%
> The throughput of a FastEthernet network is 80 Mb/s. The
traffic overhead for establishing sessions, acknowledgments, and encapsulation
is 15 Mb/s for the same time period. What is the goodput for this network?
55 Mb/s
15 Mb/s
> A network administrator is designing the layout of a new
wireless network. Which three areas of concern should be accounted for when
building a wireless network? (Choose three.)
Security*
Mobility options
Interference*
Packet collision
Coverage
area*
Extensive cabling
> Why are two strands of fiber used for a single fiber optic
connection?
They prevent crosstalk from causing interference on the connection.
They allow for full-duplex connectivity.*
The two strands allow the data to travel for longer distances without degrading.
They increase the speed at which the data can travel.
> Refer to the exhibit. What is wrong with the displayed
termination?
The cable is not shielded.
The jack used is an RJ-11 connector instead of an RJ-45
connector.
The wires are too thick for the connector that is used.
The untwisted length of each wire is too long.*
> A network administrator is required to upgrade wireless
access to end users in a building. To provide data rates up to 1.3 Gb/s and
still be backward compatible with older devices, which wireless standard should
be implemented?
802.11b
802.11ac*
802.11n
802.11g
> What is the purpose of the FCS field in a frame?
To compute the CRC header for the data field
To obtain the MAC address of the sending node
To determine if errors occurred in the transmission and
reception*
It is able to carry signals much farther than copper cabling.*
It is usually cheaper than copper cabling.
It is easier to terminate and install than copper cabling.It is able to be installed around sharp bends.
> Fill blank.
> What are two characteristics of 802.11 wireless networks?
(Choose two.)
Collisions can exist in the networks. *
Stations can transmit at any time.
They use CSMA/CA technology.*
They are collision-free networks.
> Which layer of the OSI model is responsible for specifying
the encapsulation method used for specific types of media?
Physical
Transport
Application
Data link*
> As data travels on the media in a stream of 1s and 0s how
does a receiving node identify the beginning and end of a frame?
The transmitting node sends a beacon to notify that a data frame is attached.
The transmitting node inserts start and stop bits into the frame.*
The transmitting node sends an out-of-band signal to the
receiver about the beginning of the frame.
The receiving node identifies the beginning of a frame by
seeing a physical address.
> Refer to the exhibit. The PC is connected to the console
port of the switch. All the other connections are made through FastEthernet
links. Which types of UTP cables can be used to connect the devices?
1 – rollover, 2 – crossover, 3 – straight-through
1 – crossover, 2 – straight-through, 3 – rollover
1 – crossover, 2 – rollover, 3 – straight-through
1 – rollover, 2 – straight-through, 3 – crossover*
> Match
the steps to the physical layer operations that occur when data is sent from
one node and received at another node.
Step 1 #The physical layer encodes the frames.
Step 2 #The Physical layer creates the signals that represent the bits in each frame.
Step 3 #The signals are sent on the media one at a time.
Step 4 #The physical layer retrieves the individual signals from the media.
Step 5 #The physical layer restores the individual signals to their bit representations.
> What is true concerning physical and logical topologies?
Logical topologies determine the media access control method used.*
The logical topology is always the same as the physical topology.
Physical topologies are concerned with how a network transfers
frames.
> What are two reasons for physical layer protocols to use
frame encoding techniques? (Choose two.)
To identify where the frame starts and ends*
To provide better media error correction
To distinguish data bits from control bits*
To reduce the number of collisions on the media
> How is the magnetic field cancellation effect enhanced in
UTP cables?
By increasing and varying the number of twists in each wire pair*
By increasing the thickness of the PVC sheath that encases
all the wires
By increasing the thickness of the copper wires
By decreasing the number of wires that are used to carry data
> A network administrator notices that some newly installed
Ethernet cabling is carrying corrupt and distorted data signals. The new
cabling was installed in the ceiling close to fluorescent lights and electrical
equipment. Which two factors may interfere with the copper cabling and result
in signal distortion and data corruption? (Choose two.)
EMI*
Crosstalk
Extended length of cabling
Signal attenuation
RFI*
> What is one main characteristic of the data link layer?
It generates the electrical or optical signals that represent the 1 and 0 on the media.
It accepts Layer 3 packets and decides the path by which to forward a frame to a host on a remote network.
It shields the upper layer protocol from being aware of the
physical medium to be used in the communication.*
It converts a stream of data bits into a predefined code.
> Fill in blank a number.
10,000,000,000 b/s can also be written as #”10”# Gb/s.
> Which statement describes signaling at the physical layer?
Wireless encoding includes sending a series of clicks to delimit the frames.
Sending the signals asynchronously means that they are transmitted
without a clock signal.*
In signaling, a 1 always represents voltage and a 0 always represents the absence of voltage.
Signaling is a method of converting a stream of data into a predefined code.
> Fill in blank.
What acronym is used to reference the data link sublayer
that identifies the network layer protocol encapsulated in the frame?
> Which statement is correct about multimode fiber?
SC-SC patch cords are used with multimode fiber cables.*
Multimode fiber cables carry signals from multiple connected
sending devices.
Multimode fiber commonly uses a laser as a light source.
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