Video Questions

Question 1

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

Time division multiplexing
Simplex
Broadband
Baseband

Answer 1

Baseband

Question 2

Baseband

Answer 2

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

Question 3

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

IP packet
TCP segment
UDP datagram
ICMP packet

Answer 3

IP packet

Question 4

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

Answer 4

Give referrals

DNS root name servers give referrals to appropriate authoritative TLDDNS server

Question 5

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

Answer 5

Elasticity

Question 6

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

TXT
MX
PTR
SRV

Answer 6

PTR

Question 7

PTR

Answer 7

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

Question 8

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

Answer 8

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

Question 9

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

Answer 9

Jitter is when latency and response rate vary

Question 10

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

SMF
MMF
UTP
STP

Answer 10

MMF

Question 11

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

Answer 11

a VLAN has a single broadcast domain

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

Question 12

Ports

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

Answer 12

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

Question 13

DNS Iterative lookup

Answer 13

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

Question 14

DNS Recursive lookup

Answer 14

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

Question 15

DNS Forward Lookup

Answer 15

returns an IP when given a domain

Question 16

DNS Reverse Lookup

Answer 16

returns a domain when given an IP

Question 17

Authoritiative Name Server

Answer 17

hold complete record for a domain

Question 18

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

Answer 18

Designated

Question 19

33- What is the IEEE standard for link aggregration?

802.1d
802.3ad
802.1Q
802.3af

Answer 19

802.3ad

Question 20

802.3ad

Answer 20

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

Question 21

PoE Standards

Answer 21

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

Question 22

DSCP

Answer 22

Differentiated Services Code Point

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

Question 23

WRED

Answer 23

Weighted Random Early Detection

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

Question 24

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

HDSL
IDSL
VDSL
RADSL

Answer 24

RADSL: Rate Adaptive DSL

Also for notes

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

Question 25

42- Which layer of the three tiered model is most concerned with speed? Access/edge Core Policy Distribution/Aggregration

Answer 25

Core

Question 26

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

Answer 26

Each leaf device connects to each spine device

Question 27

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%

Answer 27

5% to 10%

Question 28

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

Answer 28

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

Question 29

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

Answer 29

Initialization vector

Question 30

50- What are logical groupings of SNMP systems known as? Communities Nodes Pairs Mirrors

Answer 30

Communities