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Chapter 1 Flashcards

1
Q

What are the first hex digits of an IPv6 link-local address?

A

FE80

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2
Q

What are the first hex digits of an IPv6 multicast address?

A

FF

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3
Q

What are the first hex digits of an IPv6 unique local address?

A

FD or less commonly, FC
(binary format is 11111110)

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4
Q

What kind of IPv6 address is publicly routable?

A

Global unicast

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5
Q

What IPv6 address is private?

A

Unique local

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6
Q

How many bits long are IPv6 addresses?

A

128

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7
Q

What does an IPv6 address that pings all nodes look like?

A

FF02::1

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8
Q

What does EUI-64 do?

A

Generates the local, 64-bit, part of the IPv6 address from a 48-bit MAC address
7th bit of the MAC address is flipped, and FFFE is inserted in the middle

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9
Q

What happens if a PoE port exceeds the maximum administrative value for power?

A

The port is shut down and error-disabled

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10
Q

What is the most reliable WAN topology?

A

Full-mesh

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11
Q

What is a benefit of using a three-tier network topology over a collapsed core topology?

A

Increased redundancy and availability
Separation of core and distribution layer

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12
Q

Which network topology has the same number of hops between devices?

A

Spine-and-leaf

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13
Q

What is a disadvantage of full-mesh typologies?

A

Complex configuration
High cost

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14
Q

What WAN topology leverages a dedicated connection?

A

Point-to-point

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15
Q

Which part of an Ethernet frames helps the receiver know that it’s actual data?

A

Preamble

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16
Q

What does “media type is SFP-SR/LR” indicate?

A

The type of transceiver (small form-factor pluggable) being used, short reach/long reach

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17
Q

What is a benefit of using optical-fiber cabling as opposed to copper cabling?

A

Greater throughput
Support signals for longer distances

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18
Q

What is something that can cause a port to be placed in an error-disabled state?

A

Link flapping
Port security violation

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19
Q

What is something that can cause late collisions on an Ethernet interface?

A

Duplex mismatch
Exceeded cable length limits

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20
Q

FTP uses which ports?

A

TCP 20 and 21

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21
Q

SSH uses which port?

A

TCP 22

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22
Q

SMTP uses which port?

A

TCP 25

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23
Q

What kind of IPv6 address is equivalent to a public IPv4 address?

A

Global unicast

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24
Q

What kind of IPv6 address is used on a single link for purposes such as automatic address configuration, neighbor discovery, or in the absence of routers

A

Link-local

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25
What kind of IPv6 address is not routable over the internet?
Unique local
26
What identifies a wireless network for an edge device to connect?
Service-set identifier (SSID)
27
What are the non overlapping 2.4GHz channels?
1, 6, 11
28
What service model provides ready-to-use software/applications?
Software-as-a-service (SaaS)
29
What kind of traffic does a switch use to build its MAC address table?
Ingress traffic
30
What does MAC address aging do?
Removes unused MAC addresses from the table after a certain period of inactivity
31
What does a hypervisor do?
Controls and distributes physical resources for each virtual machine, thus allowing them to communicate
31
What does a switch do if it receives a frame with an unknown destination MAC address?
Floods packets to all ports except for the receiving port in the given VLAN
32
What can a duplex mismatch cause?
Interface will still work but it may cause input errors, CRCs, late collisions, and runts
33
How might a duplex mismatch occur?
Old equipment, incorrect manual configuration, auto-negotiation issues
34
How would you avoid duplex mismatches?
Enable auto-negotiation on all Ethernet interfaces. If auto-negotiation is disabled or unsupported, configure both interfaces with the same duplex settings
35
What is a reason an interface might be in a down/down state?
The interface is error-disabled, speed mismatch
36
When is a collision classified as late?
Collision occurs after the first 64 bytes of the frame is received
37
What is a benefit of using 2.4GHz wifi over 5Ghz?
Longer range of coverage
38
What is a benefit of using 5GHz wifi over 2.4Ghz?
Transmits data faster, has 24 non-overlapping channels
39
What is a characteristic of an SSID?
32 alphanumeric characters Case-sensitive
40
What 802.11 standards support only 5GHz frequencies?
802.11a, 802.11ac
41
What 802.11 standards support only 2.4GHz frequencies?
802.11, 802.11b, 802.11g
42
What 802.11 standards support both 2.4GHz and 5GHz frequencies?
802.11n, 802.11ax
43
What type of connectors are required for SFP and SFP+ optics?
LC (lucent connector = fiber)
44
What type of connectors are used with GBIC? (gigabit interface converter)
SC (square connectors)
45
What kind of architecture is broadband cable access good for?
SOHO
46
In physical layering standards, which Letter at the end represents twisted pair cable?
T
47
In physical layering standards, which Letter at the end can represent a fiber cable?
LX LR SR E
48
What is the difference between UTP and STP cables?
STP cables are shielded and protect against EMI
49
What is a benefit of using optical-fiber cabling over copper cabling?
Faster speeds, carries signals for longer distances, not affected by EMI
50
What is the core size of OM3, OM4, and OM5 multimode fiber cables?
50 microns
51
What is the core size of OM1 and OM2 multimode fiber cables?
62.5 microns
52
Which mode of fiber is preferred for longer distances with little loss of integrity?
Single-mode
53
What is the core size of single-mode fiber cables?
9 microns
54
Describe E-Tree
Hub and spoke/partial mesh - all sites can communicate with the central site but not with each other
55
Describe E-Line
point-to-point service between two sites, multiple E-Lines can run on a single physical access link, so central sites can connect to several remote sites
56
Describe E-LAN
Full mesh, acts as an ordinary LAN where all sites can communicate directly with each other
57
Describe MPLS
A Layer 3 service where ISP creates a large IP network and connects all of its customers to it
58
Class A range
1.1.1.1-126.255.255.255
59
Class B range
127.0.0.0-191.255.255.255
60
Class C range
192.0.0.0-223.255.255.255
61
Class D range
224.0.0.0-239.255.255.255
62
Class E range
240.0.0.0-255.255.255.255
63
What IP address block is reserved by IANA for host loopback addresses?
127.0.0.0/8
64
What command is required to enable ipv6 routing?
ipv6 unicast-routing
65
What offers software or application on a subscription basis that is hosted on the cloud?
SaaS
66
What offers cloud services on a pay-as-you-go basis within a virtualized environment?
IaaS
67
What do the consumers manage in PaaS?
Application and data
68
What do the consumers manage in SaaS?
Nothing
69
What to do the consumers manage in IaaS?
Application, data, runtime, middleware, O/S
70
What is Google Suite and Office 365 an example of?
SaaS
71
What are some examples of IaaS?
AWS, Microsoft Azure, Oracle Cloud, IBM cloud
72
What is the default mac address-table aging time?
300 seconds
73
What command will save your configuration if "write" isn't supported?
#copy running-config startup-config
74
How do you view your ip info on windows cmd?
ipconfig ipconfig /all
75
How do you refresh the DHCP IP command on windows cmd?
ipconfig /renew
76
How do you view a list of routes on windows cmd?
netstat -rn
77
How can you configure the switching mode?
switching-mode store-forward (cut-through mode is enabled by default)
78
What is store-and-forward switching?
Packets with FCS errors are dropped CPU ports automatically operate in this mode It's activated automatically when the port is oversubscribed
79
What class A addresses are reserved for private, internal use?
10.0.0.0/8 10.0.0.0 - 10.255.255.255
80
What class B addresses are reserved for private, internal use?
172.16.0.0/12 172.16.0.0 - 172.31.255.255
81
What class C addresses are reserved for private, internal use?
192.168.0.0/16 192.168.0.0 - 192.168.255.255
82
What does the FC do in an 802.11 MAC frame?
Used to indicate whether the frame is a management frame
83
Which types of IPv6 are not routable?
Link-local Link-local multicast (FF01, FF02)
84
What is the maximum bandwidth of a CAT 5e cable?
1,000 Mpbs
85
What is the protocol that refers to private IP addresses?
RFC 1918
86
What range of MAC addresses is designated for Ethernet multicast?
0100-5e00-0000 through 0100-5e7f-ffff
87
What MAC address is used for Ethernet broadcast?
ffff-ffff-ffff
88
What is the 802.11 MAC frame format?
FC DUR ADD1 ADD2 ADD3 SEQ ADD4 DATA FCS

CCNA (6 decks)

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