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Network+ > Video Questions > Flashcards

Video Questions Flashcards

https://www.youtube.com/watch?v=2ok-MEEBqAs

1
Q

V-3: Which approach to bandwidth usage consumes all the available frequencies on a medium to transmit data?

Time division multiplexing
Simplex
Broadband
Baseband

A

Baseband

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2
Q

Baseband

A

Baseband uses an entire medium to transmit.

Broadband can divide the medium into different channels. Think coaxial for Cable, divides into voice, internet and TV

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3
Q

V-4: What is encapsulated directly inside of a frame?

IP packet
TCP segment
UDP datagram
ICMP packet

A

IP packet

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4
Q

V-5: How do DNS root name servers respond to DNS queries?

Give actual answers to queries
Give referrals
Check authentication
Query another server on behalf of their clients

A

Give referrals

DNS root name servers give referrals to appropriate authoritative TLDDNS server

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5
Q

19: Which cloud characteristic refers to the ability to dynamically scale resources as needed during times of great demand as well as times of low demand?

Scalability
Elasticity
On-Demand
Centralized

A

Elasticity

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6
Q

23- What type of DNS record is used to perform reverse lookups?

TXT
MX
PTR
SRV

A

PTR

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7
Q

PTR

A

DNS record used to peform reverse lookups. Good for finding a domain name associated with an IP address

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8
Q

27-If two devices simultaneously transmit data oin an Ethernet network and a collision occurs, what does each station do in an attempt to resend the data and avoid another collision?

  • Each device waits for the clear-to-send (CTS) signal fom the switch
  • Each device randomly picks a priority value, and the device with the highest value transmits first.
  • Each device compares the other devices priorit value (Determined by IP address) with its own and the device with the highes priority value transmits first
  • Each device sets a random back-off timer, and a device attempts retransmission after the timer expires
A

Each device sets a random back-off timer, and a device attempts retransmission after the timer expires

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9
Q

28- Whats thje difference between latency and jitter?

There is no difference between the two
Latency is when jitter and response rate vary
Jitter is a measure for LANs, while latency is a measure for WANs
Jitter is when latency and response rate vary

A

Jitter is when latency and response rate vary

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10
Q

29- What kind of media is used by 100GBASE-SR10 Ethernet?

SMF
MMF
UTP
STP

A

MMF

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11
Q

30- Which of the following statements are true regarding VLANs? (Choose two)

  • a VLAN has a single broadcast domain
  • A VLAN has a single collision domain
  • For traffic to pass between two VLAN, the traffic must be routed
  • Because of a switch’s MAC address table, traffic does not need to be routed to pass between two VLANS
A

a VLAN has a single broadcast domain

For traffic to pass between two VLAN, the traffic must be routed

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12
Q

Ports

DHCPv6 client
DHCPv6 server
SMTPS
LDAPS
IMAPS
POPS
RTP (real time transport)
SIP (session initiation protocol)

A

DHCPv6 client: 546
DHCPv6 server: 547
SMTPS: 587
LDAPS: 636
IMAPS: 993
POPS: 995
RTP (real time transport): 5004
SIP (session initiation protocol): 5060

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13
Q

DNS Iterative lookup

A

name server responding to a request with either requested record or the authoritative server address

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14
Q

DNS Recursive lookup

A

queries other servers until it finds the requested record or times out

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15
Q

DNS Forward Lookup

A

returns an IP when given a domain

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16
Q

DNS Reverse Lookup

A

returns a domain when given an IP

17
Q

Authoritiative Name Server

A

hold complete record for a domain

18
Q

32- In a topology running STP, every networks segment has a single ____ port, which is th eport on that segment that is closet to the root bridge in terms of cost

Root
Nondesignated
Designated
Nonroot

A

Designated

19
Q

33- What is the IEEE standard for link aggregration?

802.1d
802.3ad
802.1Q
802.3af

A

802.3ad

20
Q

802.3ad

A

the IEEE standard for link aggregration, aka LACP or Link Aggregration Control Protocol.

Defines a method for combining multiple physical connections together into a single logical link

21
Q

PoE Standards

A

IEEE 802.3af (PoE) - Type 1 Device - 15.4W
IEEE 802.3at (PoE+) - Type 2 Device - 25.5W
IEEE 802.3bt (PoE++) - Type 3 Device - 60W

22
Q

DSCP

A

Differentiated Services Code Point

  • field in IP header to specify QoS for packets
  • helps routers and switches prioritize packets
23
Q

WRED

A

Weighted Random Early Detection

  • congestion avoidance mechanism
  • drops packets before a queue becomes congested
24
Q

40- Which DSL technology can adjust is transmission speed based on line conditions?

HDSL
IDSL
VDSL
RADSL

A

RADSL: Rate Adaptive DSL

Also for notes

HDSL: high bitrate DSL
VDSL: Very highrate DSL
IDSL: Internet DSL

25
Q

42- Which layer of the three tiered model is most concerned with speed?

Access/edge
Core
Policy
Distribution/Aggregration

A

Core

26
Q

43- How is connectivity for the Cisco ACI spine and leaf model implemented?

  • Each leaf device connects to each spine device
  • Each leaf device must connect to each other leaf device
  • Each spine device connects to every other spine device
  • Each spine device connects to every other device
A

Each leaf device connects to each spine device

27
Q

45- When extending the range for a 2.4 GHz WLAN, you can use nonoverlapping channels for adjacent coverage cells. However, there should be some overlap in coverage between those cells (using nonoverlapping channels) to prefvent a connection from dropping as a user roams from one coverage cell to another. What percentage of coverage overlap is recommended for these adjacent cells?

10% to 15%
20% to 25%
15% to 20%
5% to 10%

A

5% to 10%

28
Q

47- Which of the following is MOST likely to generate significant East-West traffic in a data center?

  • A duplication of a hosted virtual server to another physical server for redundancy
  • A query from an IoT device to a cloud-hosted server for a firmware update
  • A backup of a large video presentatrion to cloud storage for archival purposes
  • A dowbload of navigation data to a portal device for offline access
A

A duplication of a hosted virtual server to another physical server for redundancy

29
Q

48- WEP RC4’s approach to encryption uses a 24-bit string of characters added to transmitted data, such that the same plaintext data frame willnever appear as the same WEP-encrypted data frame. What is this string of characters called?

Orthogonal descriptor
Session key
Initialization vector
Chips

A

Initialization vector

30
Q

50- What are logical groupings of SNMP systems known as?

Communities
Nodes
Pairs
Mirrors

A

Communities

Network+ (10 decks)

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