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Introduction to networks 2 Flashcards | StudBud
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Introduction to networks 2
Introduction to networks 2
60 terms
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StudBud Administration
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Cisco chapters 3,4,6,7,8,9
Flashcards
60 cards
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Questions
60
Answers
1
What are two characteristics of 802.11 wireless networks? (Choose two.)
They are collision-free networks.
They use CSMA/CA technology.
They use CSMA/CD technology.
Collisions can exist in the networks.
2
Which statement describes a hardware feature of a Cisco 1941 router that has the default hardware configuration?
It doesn’t require CPU because it relies on CF to run the IOS
It has 3 FastEthernet interfaces for LAN access
It has 2 types of ports that can be used to access the console
It does not have an AUX port.
3
Which characteristic is associated with UDP sessions?
Transmitted data segments are tracked.
Received data is unacknowledged
Unacknowledged data packets are retransmitted.
Destination devices reassemble messages
4
A message is sent to all hosts on a remote network. Which type of message is it?
multicast
limited broadcast
unicast
directed broadcast
5
What is the prefix length notation for the subnet mask 255.255.255.240
/27
/24
/28
/23
6
What is the decimal equivalent of the binary number 10010101?
213
168
150
149
7
What is one advantage that the IPv6 simplified header offers over IPv4?
smaller-sized header
little requirement for processing checksums
efficient packet handling
smaller-sized source and destination IP addresses
8
What statement illustrates a drawback of the CSMA/CD access method?
Deterministic media access protocols slow network performance.
CSMA/CD LAN technologies are slower than other LAN technologies.
It is more complex than non-deterministic protocols.
Collisions can decrease network performance.
9
Which subnet mask would be used if 5 host bits are available?
255,255,255,224
255,255,255,250
255,255,255,240
255.255.255.0
10
What statement describes Ethernet?
It defines a standard model used to describe how networking works.
It is the required Layer 1 and 2 standard for Internet communication.
It defines the most common LAN type in the world.
It connects multiple sites such as routers located in different countries.
11
If a network device has a mask of /28, how many IP addresses are available for hosts?
14
255
256
30
12
Which IP addresse is NOT private ?
224.6.6.6
172.32.5.2
172.15.4.4
192.168.5.5
13
What subnet mask is represented by the slash notation /20?
255.255.0.0
255.255.224.0
255.255.240.0
255.255.255.0
14
Which switching method uses the CRC value in a frame?
fragment-free
store-and-forward
fast-forward
cut-through
15
Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?
MAC and port addresses
port address only
MAC and IP addresses
IP address only
16
What type of information is included in the transport header?
encoded application data
destination and source physical addresses
destination and source logical addresses
destination and source port numbers
17
What statement describes a characteristic of MAC addresses?
They are only routable within the private network.
They must be globally unique.
They have a 32-bit binary value.
They are added as part of a Layer 3 PDU.
18
Which statement is correct about IPv6 addresses?
IPv6 addresses are rapresented by decimal numbers
IPv6 addresses are represented by hexadecimal numbers.
IPv6 addresses are 32 bits in length.
IPv6 addresses are 64 bits in length.
19
Which characteristic describes crosstalk?
the distortion of the network signal from fluorescent lighting
the weakening of the network signal over long cable lengths
the distortion of transmitted messages by signals in adjacent wires
the loss of wireless signal over excessive distance from the access point
20
When is UDP preferred to TCP?
when all the data must be fully received before using it
When an application can tolarate some loss of data during trasmission
when segments must arrive in a very specific sequence
when a client sends a segment to a server
21
What is the complete range of TCP and UDP well-known ports?
0 to 255
0 to 1023
256 – 1023
1024 – 49151
22
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/CA and Network 2 uses CSMA/CD.
Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.
23
Which destination address is used in an ARP request frame?
255,255,255,255
01-00-5E-00-AA-23
0.0.0.0
FFFF.FFFF.FFFF.
24
Which part is a component of an IPv4 address?
host portion
broadcast portion
physical portion
logical portion
25
Which field in the IPv4 header is used to prevent a packet from traversing a network endlessly?
Time-to-Live
Acknowledgment Number
Differentiated Services
Sequence Number
26
What is a reason a network administrator might want to create subnets?
reduction in number of routers needed
easier to implement security policies
reduction in number of switches needed
simplifies network design
27
Which one is the identifier of the transport level?
TCP
UDP
ip adress
port number
28
What is contained in the trailer of a data-link frame?
physical address
error detection
data
logical address
29
What is a characteristic of UDP?
datagrams take same path and arrive in correct order at destination
Applications that use UDP are considered unreliable
UDP passes data when the destination's ready to receive it
UDP reassemble the received data in the order they were received
30
Which factor determines TCP window size?
the amount of data to be transmitted
the number of services included in the TCP segment
the amount of data the destination can process at one time
the amount of data the source is capable of sending at one time
31
What information is used by TCP to reassemble and reorder received segments?
port numbers
sequence numbers
acknowledgment numbers
fragment numbers
32
Why does HTTP use TCP as the transport layer protocol?
because HTTP is a best-effort protocol
because transmission errors can be tolerated easily
because HTTP requires reliable delivery
to ensure the fastest possible download speed
33
Which of these addresses is the shortest abbreviation for the IP address: 3FFE:1044:0000:0000:00AB:0000:0000:0057?
3FFE:1044::AB::57
3FFE:1044:0:0:AB::57
3FFE:1044:0:0:00AB::0057
3FFE:1044:0000:0000:00AB::0057
34
The ARP table in a switch maps which two types of address together?
Layer 3 address to a Layer 4 address
Layer 2 address to a Layer 4 address
Layer 3 address to a Layer 2 address
Layer 4 address to a Layer 2 address
35
What does a client do when it has UDP datagrams to send?
It sends a simplified three-way handshake to the server.
It queries the server to see if it is ready to receive data.
it just sends the datagrams
It sends to the server a segment with the SYN flag
36
What type of address is automatically assigned to an interface when IPv6 is enabled on that interface?
unique local
Link-local
loopback
global unicast
37
Which IPv4 header field is responsible for defining the priority of the packet?
differentiated services
traffic class
flags
flow label
38
What is the minimum Ethernet frame size that will not be discarded by the receiver as a runt frame?
1500 bytes
1024 bytes
512 bytes
64 bytes
39
What are two types of router interfaces?
Wan
Telnet
Lan
Dhcp
40
How many bits are in an IPv4 address?
32
256
128
64
41
What type of route is indicated by the code C in an IPv4 routing table on a Cisco router?
static route
default route
dynamic route that is learned through EIGRP
directly connected route
42
What is the function of the CRC value?
to verify the logical address in the frame
to compute the checksum header for the data field in the frame
to verify the integrity of the received frame
to verify the physical address in the frame
43
Which three commands are used to set up secure access to a router through a connection to the console interface?
password cisco
login
line console 0
interface fastethernet 0/0
44
Which statement is correct about IPv4 addresses?
IPv4 addresses are represented by hexadecimal numbers.
IPv4 addresses are 128 bits in length.
IPv4 addresses are represented by binary numbers.
IPv4 addresses are 32 bits in length.
45
What does the IP address 172.17.4.250/24 represent?
network address
broadcast address
multicast address
host address
46
What is the binary equivalent of the decimal number 197?
10011000
11000101
11110010
11101000
47
Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?
port address only
MAC address only
MAC and IP addresses
MAC and port addresses
48
What is indicated by the term throughput?
the guaranteed data transfer rate offered by an ISP
the measure of the usable data transferred across the media
the measure of the bits transferred across the media over a sec.
the capacity of a particular medium to carry data
49
What are two examples of hybrid topologies? (Choose 2)
partial mesh
point-to-point
full mesh
extended star
50
What is the purpose of the startup configuration file on a Cisco router?
provides a limited backup version of the IOS
limits commands used to initially configure a router on startup
limits the config. commands the router IOS is currently using
facilitates the basic operation of the HW components of a device
51
What is the purpose of ICMP messages?
to provide feedback of IP packet transmissions
to inform routers about network topology changes
to ensure the delivery of an IP packet
to Init Control of Maximum Packet
52
What IPv4 header field identifies the upper layer protocol carried in the packet?
Protocol
Version
Differentiated Services
Identification
53
What is the definition of bandwidth?
the speed at which bits travel on the network
the measure of the transfer of bits across the media in a sec.
the amount of data that can flow from one place to another in a sec.
the measure of usable data transferred in a sec.
54
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?
application
data link
transport
physical
55
What routing table entry has a next hop address associated with a destination network?
C and L source routes
remote routes
local routes
directly-connected routes
56
What is one main characteristic of the data link layer?
It decides the path of a frame directed to a host on a remote network.
It converts a stream of data bits into a predefined code.
It avoids to upper layer protocol to be aware of the medium to be used.
It generates the signals representing the 1 and 0 on the media.
57
What is the result of connecting multiple switches to each other?
The number of broadcast domains is increasing.
the size of the broadcast domain increases
The size of the collision domain decreases.
The number of collision domains decreases.
58
What is a type of IPv6 unicast adress?
loopback
anycast
broadcast
multicast
59
What happens if part of an TCP message is not delivered to the destination?
The entire message is resent
The lost part of the message is resent
The message is lost because TCP is not reliable
That part of the message is lost
60
What happens to runt frames received by a Cisco Ethernet switch?
The frame is dropped.
The frame is sent to the default gateway.
The frame is broadcast to all other devices on the same network.
The frame is returned to the originating network device.
