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Cybersecurity > NAT, CDP, LLDP > Flashcards

NAT, CDP, LLDP Flashcards

1
Q

NAT addresses concerns over the dwindling IPv4 address space by _____.

A

Allowing computers using non-routable address space to communicate with the Internet.

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2
Q

What technique allows for inbound traffic through a NAT?

A

Port forwarding

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3
Q

The total number of IPv4 addresses is approximately

A

4.2 billion

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4
Q

What is port forwarding?

A

allows computers over the Internet to connect to a specific computer or service within a private network

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5
Q

What is Remote desktop connection (RDC)?

A

a Windows tool that gives a user access to a Windows desktop from anywhere on the Internet.

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6
Q

What is a Public IP address?

A

identifies a particular device on the public internet

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7
Q

What is a port?

A

A logical connection that is used by programs and services to exchange information

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8
Q

Without any port forwarding configured, your router?

A

does not know what to do with this request

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9
Q

What is the range for Private IP addresses?

A
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10
Q

Class “A” Private IP Address Range

A

10.0.0.0 to 10.255.255.255

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11
Q

Class “B” Private IP Address Range

A

172.16.0.0 to 172.31.255.255

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12
Q

Class “C” Private IP Address Range

A

192.168.0.0 to 192.168.255.255

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13
Q

Class “A” Address Ranges

A

1.0.0.0 to 126.255.255.255

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14
Q

Class “B” Address Ranges

A

128.0.0.0 to 191.255.255.255

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15
Q

Class “C” Address Ranges

A

192.0.0.0 to 223.255.255.255

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16
Q

Loopback IPv4 Address

A

127.0.0.1

17
Q

Loopback IPv6 Address

A

::1

18
Q

What is APIPA?

A

The Automatic Private IP Address. APIPA is a mechanism natively incorporated in computers running Microsoft Windows. The idea of such a mechanism is to guarantee that computers still receive an IP address in case of unavailability or failure of a DHCP server. Starts at 169.254 then its apipa

19
Q

What is CDP and what layer does it operate?

A

CDP (Cisco Discovery Protocol) is a Layer 2 Cisco proprietary
protocol enabled by default on all Cisco devices. Its purpose is
similar to the purpose of NDP.
CDP can be disabled on specific devices or interfaces for
security reasons.

20
Q

What is the default interval at which Cisco devices send Cisco Discovery Protocol advertisements?

A

60 seconds hold timer 180 seconds

21
Q

Which statement about Cisco Discovery Protocol configuration on a Cisco switch is true?

A. CDP is enabled by default and can be disabled globally with the command no cdp run.

A

A. CDP is enabled by default and can be disabled globally with the command no cdp run

22
Q

A network engineer notices inconsistent Cisco Discovery Protocol neighbors according to the diagram that is provided. The engineer notices only a single neighbor that uses Cisco Discovery Protocol, but it has several routing neighbor relationships. What would cause the output to show only the single neighbor?

A

The routers are connected via a Layer 2 switch.

23
Q

After the implementation of several different types of switches from different vendors, a network engineer notices that directly connected devices that use Cisco Discovery Protocol are not visible. Which vendor-neutral protocol could be used to resolve this issue?

A

Link Layer Discovery Protocol

24
Q

While doing network discovery using Cisco Discovery Protocol, it is found that rapid error tracking is not currently enabled. Which option must be enabled to allow for enhanced reporting mechanisms using Cisco Discovery Protocol?

A

Cisco Discovery Protocol version 2

25
Q

A network engineer has just deployed a non-Cisco device in the network and wants to get information about it from a connected device. Cisco Discovery Protocol is not supported, so the open standard protocol must be configured. Which protocol does the network engineer configure on both devices to accomplish this?

A

LLDP

26
Q

Which statement about Cisco devices learning about each other through Cisco Discovery Protocol is true?

A. Each device sends periodic advertisements to multicast address 01:00:0C:CC:CC:CC
B. Each device broadcasts periodic advertisements to all of its neighbors.
C. Each device sends periodic advertisements to a central device that builds the network topology.
D. Each device sends periodic advertisements to all IP addresses in its ARP table.

A

Each device sends periodic advertisements to multicast address 01:00:0C:CC:CC:CC

27
Q

Which option lists the information that is contained in a Cisco Discovery Protocol advertisement?

A. native VLAN IDs, port-duplex, hardware platform
B. native VLAN IDs, port-duplex, memory errors
C. native VLAN IDs, memory errors, hardware platform
D. port-duplex, hardware platform, memory errors

A

native VLAN IDs, port-duplex, hardware platform

28
Q

What is LLDP?

A

Link Layer Discovery Protocol - industry standard protocol, meaning it is not proprietary and can operate on any network device, and even on PCs and servers.
Although LLDP is not enabled by default on Cisco devices, it is fully supported. Developed by IEEE

29
Q

Which statement about using native VLANs to carry untagged frames is true?

A. Cisco Discovery Protocol version 2 carries native VLAN information, but version 1 does not.
B. Cisco Discovery Protocol version 1 carries native VLAN information, but version 2 does not.
C. Cisco Discovery Protocol version 1 and version 2 carry native VLAN information.
D. Cisco Discovery Protocol version 3 carries native VLAN information, but versions 1 and 2 do not.

A

Cisco Discovery Protocol version 2 carries native VLAN information, but version 1 does not.

30
Q

Which statement regarding broadcasts and VLANs is true?

A
31
Q

When does LLDP send advertisements?

A

LLDP sends advertisement packets every 30 seconds by default to all directly connected device

32
Q

What is the LLDP Hold Timer?

A

If a device does not receive LLDP packets from a neighbor for 120 seconds, it will consider that neighbor “dead“ and remove it from its neighbor table.

33
Q

What is a Mismatch Error Detection?

A

CDP includes a unique feature that can detect a protocol-connection
mismatch. When such a mismatch is detected, CDP notifies the network
administrator by recording the incident in a log.
Examples of mismatch types include:
* Native VLAN mismatch
* Duplex mismatch

34
Q

What are the two types of ACL’s

A

Standard and Extended

35
Q

What are standard ACL’s?

A

Standard ACLs examine only the source IP address when implementing restrictions.
Cisco recommends placing this type of ACL as close to the destination device as
possible

36
Q

What are extended ACL’s?

A

Extended ACLs filter packets according to protocol type, source or destination IP
address, and source or destination port. Cisco recommends placing this type of ACL as close to the source as possible.

Cybersecurity (33 decks)

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