Intro to networks chapters 4-7
What kind of network would use point-to-point, hub and spoke, or mesh topologies?
WAN
What is the special value assigned to first 24 bits of multicast MAC address transporting IPv4 packet?
01-00-5E
How many binary bits exist within IPv6 address?
128
How many bits are in IPv4 address?
32
What are two sizes (minimum and expected maximum) of Ethernet frame?
64 and 1518 bytes
Which of the following are data link protocols?
802.11, Ethernet, and PPP (Point-to-Point Protocol)
What Layer 2 function does a router perform?
Accepts frame from medium De-encapsulates fame Re-encapsulates packet into new fame
What are two services performed by the data link layer of OSI model?
Accepts layer 3 packets and encapsulates them into frames and provides media access control and performs error detection
What type of address is 01-00-5E-0A-00-02?
Address that reaches specific group of hosts
Why are two strands of fiber used for single fiber optic connection?
Allow full duplex connectivity
What feature automatically negotiates best speed and duplex setting between interconnecting devices?
Autonegotiation
Which of these is the name for capacity of medium to carry data? Amount of data flown from one place to another
Bandwidth
ZigBee
Best suited for industrial and IoT environments
What method is used to manage contention-based access on wireless network? Which data link layer media access control method does Ethernet use with legacy Ethernet hubs?
CSMA/CD
Which media access control method is used in legacy Ethernet LANs?
Carrier sense multiple access/collision detection
What is one advantage of using fiber optic cabling rather than copper cabling?
Cary signals much farther than copper cabling
Which of the following attaches antennas to wireless devices? It can also be bundled with fiber-optic cabling for two-way data transmission. Which of the following terminates with BNC (Bayonet Neill-Concelman), N type and F type connectors?
Coaxial
Which function or operation is performed by LLC sublayer?
Communicates with upper protocol layers
What is a function of MAC sublayer?
Controls access to media, checks for errors in received bits, and uses CSMA/CD or CSMA/CD to support Ethernet technology
Which statement correctly describes frame encoding?
Converts bits into predefined code to distinguish data bits from control bits, and identifying beginning and end of frame.
Which media uses electrical pulses to represent bits?
Copper
What are two methods for switching data between ports on a switch?
Cut-through and store-and-forward switching
Which switching method can be implemented using fast-forward switching or fragment-free switching?
Cut-through switching
Which part of Ethernet Frame uses pad to increase frame field to at least 64 bytes?
Data field
Physical layer of receiving device passes bits up to which higher level layer? Which layer of OSI model is responsible for specifying encapsulation method used for specific types of media?
Data link
Which statement describes half-duplex mode of data transmission?
Data that is transmitted over network flows in one direction at a time
Which lists Layer 2 and Layer 3 address fields in correct order?
Destination NIC, Source NIC, Source IP, Destination IP
What is the function of last field in data link layer frame?
Determine whether frame experience transmission errors
What will host on Ethernet network do if it receives frame with unicast destination MAC address that does not match its own MAC address?
Discard frame
Which characteristic describes crosstalk?
Distortion of transmitted messages from signals carried in adjacent wires
Which IPv4 address format was created for ease of use by people and is expressed as 201.192.1.14?
Dotted decimal
A network administrator is designing new network infrastructure that includes both wired and wireless connectivity. Under which situation would wireless connection be recommended?
End user device needs mobility when connecting to network
Which part of Ethernet Frame describes higher-layer protocol that is encapsulated?
EthertType
What is true concerning physical and logical topologies?
Logical topologies refer to how network transfers data between devices
Which topology displays networking device layer IP addresses?
Logical topology
Which LAN topology is a hybrid topology?
Extended star
Physical layer is only concerned with wired network connections. Wireless is not well suited for enterprise networks Wireless LANs operate in full-duplex allowing all devices to send or receive data at the same time so number of users does not impact performance.
False
auto-MDIX
Feature that detects (identify) type of cable
Which media uses patterns of light to represent bits?
Fiber-optic
Which statement is true about MAC addresses?
First three bytes are used by vendor assigned OUI (organizationally unique identifier).
What PDU is received by physical layer for encoding and transmission?
Frame
Which part of Ethernet frame detects errors in frame?
Frame check sequence
What happens to runt frames received by Cisco Ethernet switch?
Frame is dropped
Which duplex communication method is used in WLANs?
Half-duplex
What does data link layer add to Layer 3 packet to create frame?
Header and tralier
Multimode
Helps data travel approximately 500 meters Uses light emitting diodes (LEDs) as data light source transmitter Used within campus network
Which standards organization oversees development of wireless LAN standards? Which organization defines standards for network access layer (i.e., the OSI physical and data link layers)?
IEEE (Institute of Electrical and Electronics Engineers)
Which two engineering organizations define open standards and protocols that apply to data link layer?
IEEE and ITU (International Telecommunication Union)
Which two statements are correct about IPv4 and IPv6 addresses?
IPv4 addresses are 32 bits in length IPv6 addresses are represented by hexadecimal numbers
Attenuation
Loss of power in signal as it travels from sending device to receiving device
Which data link sublayer controls network interface through software drivers? Which data link sublayer works with upper layers to add application information for delivery of data to higher level protocols?
LLC (Limited liability company)
What are two sublayers of OSI model data link layer?
LLC and MAC
What is another name for OSI data link layer?
Layer 2
The IEEE 802 LAN/MAN data link layer consists of which two sublayers?
Logical link and media access control
What identifier is used at data link layer to uniquely (unusually) identify Ethernet device? What attribute of NIC would place it at data link layer of OSI model?
Mac address
The media access control method used depends on which two criteria?
Media sharing and topology
A technician has been asked to develop physical topology for network that provides high level of redundancy. Which physical topology requires that every node is attached to every other node on network?
Mesh
A wireless LAN is being deployed inside new one room office that is occupied by park ranger. Office is located at the highest part of national park. After network testing is complete, technicians report that wireless LAN signal is occasionally affected by some type of interference. What is a possible cause of signal distortion?
Microwave oven
A network administrator is troubleshooting connectivity issues on server. Using tester, administrator notices that signals generated by server NIC are distorted (out of shape) and not usable. In which layer of the OSI model is error categorized?
Physical layer
Which two types of memory buffering techniques are used by switches?
Port based memory and shared memory buffering
Which part of Ethernet Frame notifies receiver to get ready for new frame?
Precamble
What is the responsibility of MAC sublayer?
Provides method to get frame on and off media
IPv6 Address
Represented by hexadecimal numbers
Which two functions or operations are performed by MAC sublayer?
Responsible for media access control and adds header and trailer to form OSI layer 2 PDU
What type of cable is used to connect workstation serial port to Cisco router console port?
Rollover
Which of the following counters EMI and RFI by using shielding techniques and special connectors?
STP (Shielded twisted-pair)
What addressing information is recorded by switch to build its MAC address table?
Source layer 2 address of incoming frames
What type of physical topology can be created by connecting all Ethernet cables to central device?
Star
Which type of UTP cable is used to connect PC to switch port?
Straight through
Which two characteristics describe Ethernet technology?
Supported by IEEE 802.3 standards and uses unique MAC addresses to ensure that data is send to appropriate destination
Which network device makes forwarding decisions based on destination MAC address that is contained (hold) in frame? Which network device has primary (main) function to send data to specific (identfied) destination based on information found in MAC address table?
Switch
Which of these is a measure of transfer of bits across media over given period of time?
Throughput
What statement describes characteristic of MAC addresses?
They must be globally unique
Which is a function of Logical Link Control (LLC) sublayer?
To identify which network layer protocol is being used
What is the purpose of the OSI physical layer?
Transmitting bits across local media
Which procedure is used to reduce effect of crosstalk in copper cables?
Twisting opposing circuit wire pairs together
Which of the following is the most common network media?
UTP (unshielded twisted-pair)
Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?
Use of full duplex capable layer 2 swtiches
Bluetooth
Used for Personal Area Networks (PANs) and allows devices to communicate over distances of 1 to 100 meters
Which media uses patterns of microwaves to represent bits?
Wireless
What is a characteristic of UTP cabling?
cancellation
Single mode
use lasers in single stream as data light source transmitter used to connect long-distance telephony and cable TV applications can travel approximately 100 km
