CCNA 1: Network Fundamentals Module 9
1

In the graphic, Host A has reached 50% completion in sending a 1 KB Ethernet frame to
Host D when Host B wishes to transmit its own frame to Host C. What must Host B do?
Host B can transmit immediately since it is connected on its own cable segment.
Host B must wait to receive a CSMA transmission from the hub, to signal its turn.
Host B must send a request signal to Host A by transmitting an interframe gap.
* Host B must wait until it is certain that Host A has completed sending its frame.
2 Ethernet operates at which layers of the OSI model? (Choose two.)
Network layer
Transport layer
* Physical layer
Application layer
Session layer
* Data-link layer
3 Which of the following describe interframe spacing? (Choose two.)
* the minimum interval, measured in bit-times, that any station must wait before sending
another frame
the maximum interval, measured in bit-times, that any station must wait before sending
another frame
the 96-bit payload padding inserted into a frame to achieve a legal frame size
the 96-bit frame padding transmitted between frames to achieve proper synchronization
* the time allowed for slow stations to process a frame and prepare for the next frame
the maximum interval within which a station must send another frame to avoid being
considered unreachable
4 What three primary functions does data link layer encapsulation provide? (Choose
three.)
* addressing
* error detection
* frame delimiting
port identification
path determination
IP address resolution
5 When a collision occurs in a network using CSMA/CD, how do hosts with data to
transmit respond after the backoff period has expired?
* The hosts return to a listen-before-transmit mode.
The hosts creating the collision have priority to send data.
The hosts creating the collision retransmit the last 16 frames.
The hosts extend their delay period to allow for rapid transmission.
6 What are three functions of the upper data link sublayer in the OSI model? (Choose
three.)
recognizes streams of bits
* identifies the network layer protocol
* makes the connection with the upper layers identifies the source and destination
applications
* insulates network layer protocols from changes in physical equipment
determines the source of a transmission when multiple devices are transmitting
7 What does the IEEE 802.2 standard represent in Ethernet technologies?
MAC sublayer
Physical layer
* Logical Link
Control sublayer
Network layer
8 Why do hosts on an Ethernet segment that experience a collision use a random delay
before attempting to transmit a frame?
A random delay is used to ensure a collision-free link.
A random delay value for each device is assigned by the manufacturer.
A standard delay value could not be agreed upon among networking device vendors.
* A random delay helps prevent the stations from experiencing another collision during
the transmission.
9 Refer to the exhibit. Which option correctly identifies content that the frame data field
may contain?
preamble and stop frame
**network layer packet
physical addressing
FCS and SoF
10 Host A has an IP address of 172.16.225.93 and a mask of 255.255.248.0. Host A
needs to communicate with a new host whose IP is 172.16.231.78. Host A performs the
ANDing operation on the destination address. What two things will occur? (Choose two.)
Host A will change the destination IP to the IP of the nearest router and forward the
packet.
Host A will broadcast an ARP request for the MAC of its default gateway.
A result of 172.16.225.0 will be obtained.
* Host A will broadcast an ARP request for the MAC of the destination host.
A result of 172.16.224.0 will be obtained.
* A result of 172.16.225.255 will be obtained.
11 Which of the following is a drawback of the CSMA/CD access method?
* Collisions can decrease network performance.
It is more complex than non-deterministic protocols.
Deterministic media access protocols slow network performance.
CSMA/CD LAN technologies are only available at slower speeds than other LAN
technologies.
12 Ethernet operates at which layer of the TCP/IP network model?
application
physical
transport
internet
data link
* network access
13 What is the primary purpose of ARP?
translate URLs to IP addresses
* resolve IPv4 addresses to MAC addresses
provide dynamic IP configuration to network devices
convert internal private addresses to external public addresses
14
Refer to the exhibit. The switch and workstation are administratively configured for fullduplex
operation. Which statement accurately reflects the operation of this link?
* No collisions will occur on this link.
Only one of the devices can transmit at a time.
The switch will have priority for transmitting data.
The devices will default back to half duplex if excessive collisions occur.
15
Refer to the exhibit. Host_A is attempting to contact Server_B. Which statements
correctly describe the addressing Host_A will generate in the process? (Choose two.)
A packet with the destination IP of Router_B.
A frame with the destination MAC address of Switch_A.
A packet with the destination IP of Router_A.
* A frame with the destination MAC address of Router_A.
* A packet with the destination IP of Server_B.
A frame with the destination MAC address of Server_B.
16 Which statements correctly describe MAC addresses? (Choose three.)
dynamically assigned
* copied into RAM during system startup
layer 3 address
* contains a 3 byte OUI
* 6 bytes long
32 bits long
17 Which two features make switches preferable to hubs in Ethernet-based networks?
(Choose two.)
reduction in cross-talk
* minimizing of collisions
support for UTP cabling
* division into broadcast domains
increase in the throughput of communications
18 What are the two most commonly used media types in Ethernet networks today?
(Choose two.)
coaxial thicknet
**copper UTP
coaxial thinnet
**optical fiber
shielded twisted pair
19 Convert the binary number 10111010 into its hexadecimal equivalent. Select the
correct answer from the list below.
85
90
* BA
A1
B3
1C
20 After an Ethernet collision, when the backoff algorithm is invoked, which device has
priority to transmit data?
the device involved in the collision with the lowest MAC address
the device involved in the collision with the lowest IP address
* any device in the collision domain whose backoff timer expires first
those that began transmitting at the same time
21
Refer to the exhibit. What command was executed on a host computer to produce the
results shown?
route PRINT
* arp -a
arp -d
netstat
telnet

1121 Chapter 11

	Which IEEE specification defines Wi-Fi technology? 802.3 802.5 802.7 802.11 802.13 802.15

2	What is true regarding media access control? (Choose three.) Ethernet utilizes CSMA/CD defined as placement of data frames on the media contention-based access is also known as deterministic 802.11 utilizes CSMA/CD Data Link layer protocols define the rules for access to different media controlled access contains data collisions

3	Which characteristics describe carrier sense multiple access collision detect (CSMA/CD)? (Choose three.) reliable point-to-point nondeterministic connection-oriented collision environment first-come, first-served approach

4	Which options are properties of contention-based media access for a shared media? (Choose three.) non-deterministic less overhead one station transmits at a time collisions exist devices must wait their turn token passing

5	What determines the method of media access control? (Choose two.) network layer addressing media sharing application processes logical topology intermediary device function

6	What is true concerning physical and logical topologies? The logical topology is always the same as the physical topology. Physical topologies are concerned with how a network transfers frames. Physical signal paths are defined by Data Link layer protocols. Logical topologies consist of virtual connections between nodes.

7	Which of the following are sublayers of the Data Link layer? ACL, LMC MAC, LAC MAC, LLC OSI, LLC

8	Which features describe the concept of Carrier Sense Multiple Access with Collision Detection? (Choose two.) collisionless environment non-deterministic deterministic uses first-come, first-served approach uses a token to transmit data

9	Refer to the exhibit. Assuming that the network in the exhibit is converged meaning the routing tables and ARP tables are complete, which MAC address will Host A place in the destination address field of Ethernet frames destined for www.server? 00-1c-41-ab-c0-00 00-0c-85-cf-65-c0 00-0c-85-cf-65-c1 00-12-3f-32-05-af

10	What is the purpose of the preamble in an Ethernet frame? is used as a pad for data identifies the source address identifies the destination address marks the end of timing information is used for timing synchronization with alternating patterns of ones and zeros

11

What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.) They are 48 binary bits in length. The consist of four eight-bit octets of binary numbers. They generally represented in hexadecimal format. They are represented as decimal values for convenience. They must be changed when an Ethernet device is added or moved within the network. They are considered physical addresses.

12	A network administrator has been asked to provide a graphic representation of exactly where the company network wiring and equipment are located in the building. What is this type of drawing? logical topology physical topology cable path wiring grid access topology

13	Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.) the Layer 3 protocol selected the geographic scope of the network the PDU defined by the transport layer the physical layer implementation the number of hosts to be interconnected

14	Which three session options does PPP offer? (Choose three.) multilink multipoint connectivity compression error checking authentication fastlink

15

Which statements describe the logical token-passing topology? (Choose two.) Network usage is on a first come, first serve basis. Computers are allowed to transmit data only when they possess a token. Data from a host is received by all other hosts. Electronic tokens are passed sequentially to each other. Token passing networks have problems with high collision rates.

16	Which statements describe the logical token-passing topology? (Choose two.) Network usage is on a first come, first serve basis. Computers are allowed to transmit data only when they possess a token. Data from a host is received by all other hosts. Electronic tokens are passed sequentially to each other. Token passing networks have problems with high collision rates.

17	Refer to the exhibit. A frame is being sent from the PC to the laptop. Which source MAC and IP addresses will be included in the frame as it leaves RouterB? (Choose two.) source MAC - PC source MAC - S0/0 on RouterA source MAC - Fa0/1 on RouterB source IP - PC source IP - S0/0 on RouterA source IP - Fa0/1 of RouterB
18	What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.) They are 48 binary bits in length. They are considered physical addresses. They are generally represented in hexadecimal format. They consist of four eight-bit octets of binary numbers. They are used to determine the data path through the network. They must be changed when an Ethernet device is added or moved within the network.

19	What is the primary purpose of the trailer in a data link layer frame? define the logical topology provide media access control support frame error detection carry routing information for the frame
20	What two facts are true when a device is moved from one network or subnet to another? (Choose two.) The Layer 2 address must be reassigned. The default gateway address should not be changed. The device will still operate at the same Layer 2 address. Applications and services will need additional port numbers assigned. The Layer 3 address must be reassigned to allow communications to the new network.

21	What determines the method of media access control? (Choose two.) network layer addressing media sharing application processes logical topology intermediary device function
22	Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.) the Layer 3 protocol selected the geographic scope of the network the PDU defined by the transport layer the physical layer implementation the number of hosts to be interconnected

23	What is a characteristic of a logical point-to-point topology? The nodes are physically connected. The physical arrangement of the nodes is restricted. The media access control protocol can be very simple. The data link layer protocol used over the link requires a large frame header.
24	Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit? All three networks use CSMA/CA None of the networks require media access control. Network 1 uses CSMA/CD and Network 3 uses CSMA/CA. Network 1 uses CSMA/CA and Network 2 uses CSMA/CD. Network 2 uses CSMA/CA and Network 3 uses CSMA/CD.

25	What is a function of the data link layer? provides the formatting of data provides end-to-end delivery of data between hosts provides delivery of data between two applications provides for the exchange data over a common local media
26	What is the purpose of the preamble in an Ethernet frame? is used as a pad for data identifies the source address identifies the destination address marks the end of timing information is used for timing synchronization with alternating patterns of ones and zeros

27	What is a primary purpose of encapsulating packets into frames? provide routes across the internetwork format the data for presentation to the user facilitate the entry and exit of data on media identify the services to which transported data is associated
28 Which sublayer of the data link layer prepares a signal to be transmitted at the physical layer? LLC MAC HDLC NIC
29	What statements are true regarding addresses found at each layer of the OSI model? (Choose two.) Layer 2 may identify devices by a physical address burned into the network card Layer 2 identifies the applications that are communicating Layer 3 represents a hierarchical addressing scheme Layer 4 directs communication to the proper destination network Layer 4 addresses are used by intermediary devices to forward data

30

What is true concerning physical and logical topologies? The logical topology is always the same as the physical topology. Physical topologies are concerned with how a network transfers frames. Physical signal paths are defined by Data Link layer protocols. Logical topologies consist of virtual connections between nodes.

1121 Chapter 8

CCNA Exploration v.4.0

CCNA 1: Network Fundamentals Module 8

1. Which type of cable run is most often associated with fiber-optic cable?

**backbone cable
horizontal cable
patch cable
work area cable

2. In most business LANs, which connector is used with twisted-pair networking cable?

BNC
RJ-11
**RJ-45
Type F

3. When is a straight-through cable used in a network?

when connecting a router through the console port
when connecting one switch to another switch
**when connecting a host to a switch
when connecting a router to another router

4. With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk
within the cable pairs?

**the magnetic field around the adjacent pairs of wire
the use of braided wire to shield the adjacent wire pairs
the reflection of the electrical wave back from the far end of the cable
the collision caused by two nodes trying to use the media simultaneously

5. Which OSI layer is responsible for binary transmission, cable specification, and
physical aspects of network communication?

Presentation
Transport
Data Link
**Physical

6. An installed fiber run can be checked for faults, integrity, and the performance of the
media by using what device?
light injector
**OTDR
TDR
multimeter

7. XYZ Company is installing new cable runs on their data network. What two types of
cable would most commonly be used for new runs? (Choose two.)
coax
Cat4 UTP
**Cat5 UTP
**Cat6 UTP
STP

8. What is a possible effect of improperly applying a connector to a network cable?

Data will be forwarded to the wrong node.
**Data transmitted through that cable may experience signal loss.
An improper signaling method will be implemented for data transmitted on that cable.
The encoding method for data sent on that cable will change to compensate for the
improper connection.

9. What are three measures of data transfer? (Choose three.)

**goodput
frequency
amplitude
**throughput
crosstalk
**bandwidth

10. Refer to the exhibit. Which type of Category 5 cable is used to make an Ethernet
connection between Host A and Host B?

coax cable
rollover cable
**crossover cable
straight-through cable

11. In LAN installations where potential electrical hazards or electromagnetic interference
may be present, what type of media is recommended for backbone cabling?

coax
**fiber
Cat5e UTP
Cat6 UTP
STP

12. Which fiber connector supports full duplex Ethernet?

The correct answer is the photography 4 (2 fibers).

13. Which method of signal transmission uses radio waves to carry signals?

electrical
optical
**wireless
acoustic

14. Which characteristics describe fiber optic cable? (Choose two.)

**It is not affected by EMI or RFI.
Each pair of cables is wrapped in metallic foil.
It combines the technique of cancellation, shielding and twisting to protect data.
It has a maximum speed of 100 Mbps.
**It is the most expensive type of LAN cabling.

15. Which of the following is a characteristic of single-mode fiber-optic cable?

generally uses LEDs as the light source
relatively larger core with multiple light paths
less expensive than multimode
**generally uses lasers as the light source

16. What is considered a benefit of wireless as a media choice?

**more host mobility
lower security risks
reduced susceptibility to interference
less impact of the surroundings on the effective coverage area

17. What characteristic of UTP cable helps reduce the effects of interference?

the metal braiding in the shielding
the reflective cladding around core
**the twisting of the wires in the cable
the insulating material in the outer jacket

18. What is a primary role of the Physical layer in transmitting data on the network?

**create the signals that represent the bits in each frame on to the media
provide physical addressing to the devices
determine the path packets take through the network
control data access to the media