Podcast
Questions and Answers
What are some examples of Layer 2 security threats?
What are some examples of Layer 2 security threats?
MAC Table Attacks, VLAN Attacks, DHCP Attacks, ARP Attacks, Address Spoofing Attacks, STP Attacks
How can Port Security help prevent attacks?
How can Port Security help prevent attacks?
Prevents MAC address flooding attacks and DHCP starvation attacks
What is the purpose of Dynamic ARP Inspection (DAI)?
What is the purpose of Dynamic ARP Inspection (DAI)?
Prevents ARP spoofing and ARP poisoning attacks
What is the main vulnerability exploited in MAC address table flooding attacks?
What is the main vulnerability exploited in MAC address table flooding attacks?
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What are some recommended strategies for securing management protocols?
What are some recommended strategies for securing management protocols?
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What is the significance of Layer 2 security in a network?
What is the significance of Layer 2 security in a network?
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How can a threat actor's access to Layer 2 frames affect network security?
How can a threat actor's access to Layer 2 frames affect network security?
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Why is Layer 2 considered the weakest link in the system?
Why is Layer 2 considered the weakest link in the system?
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What security solutions do network administrators use to protect layers 3 through 7?
What security solutions do network administrators use to protect layers 3 through 7?
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Why is it important for network administrators to routinely implement security solutions?
Why is it important for network administrators to routinely implement security solutions?
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MAC address flooding attacks take advantage of this limitation by bombarding the switch with fake source MAC addresses until the switch MAC address table is full. When this occurs, the switch treats the frame as an unknown unicast and begins to flood all incoming ______.
MAC address flooding attacks take advantage of this limitation by bombarding the switch with fake source MAC addresses until the switch MAC address table is full. When this occurs, the switch treats the frame as an unknown unicast and begins to flood all incoming ______.
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To make forwarding decisions, a Layer 2 LAN switch builds a table based on the source MAC addresses in received ______. This is called a MAC address table.
To make forwarding decisions, a Layer 2 LAN switch builds a table based on the source MAC addresses in received ______. This is called a MAC address table.
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These Layer 2 solutions will not be effective if the management protocols are not ______.
These Layer 2 solutions will not be effective if the management protocols are not ______.
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Always use secure variants of management protocols such as SSH, Secure Copy Protocol (SCP), Secure FTP (SFTP), and Secure Socket Layer/Transport Layer Security (SSL/TLS). Consider using out-of-band management network to manage devices. Use a dedicated management VLAN where nothing but management ______ resides.
Always use secure variants of management protocols such as SSH, Secure Copy Protocol (SCP), Secure FTP (SFTP), and Secure Socket Layer/Transport Layer Security (SSL/TLS). Consider using out-of-band management network to manage devices. Use a dedicated management VLAN where nothing but management ______ resides.
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Use ACLs to filter unwanted ______.
Use ACLs to filter unwanted ______.
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Network administrators routinely implement ______ solutions to protect the elements in Layer 3 up through Layer 7. They use VPNs, firewalls, and IPS devices to protect these elements. However, if Layer 2 is compromised, then all the layers above it are also affected. For example, if a threat actor with access to the internal network captured Layer 2 frames, then all the ______ implemented on the layers above would be useless. The threat actor could cause a lot of damage on the Layer 2 LAN networking infrastructure.
Network administrators routinely implement ______ solutions to protect the elements in Layer 3 up through Layer 7. They use VPNs, firewalls, and IPS devices to protect these elements. However, if Layer 2 is compromised, then all the layers above it are also affected. For example, if a threat actor with access to the internal network captured Layer 2 frames, then all the ______ implemented on the layers above would be useless. The threat actor could cause a lot of damage on the Layer 2 LAN networking infrastructure.
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Security is only as strong as the ______est link in the system, and Layer 2 is considered to be that ______ link. This is because LANs were traditionally under the administrative control of a single organization.
Security is only as strong as the ______est link in the system, and Layer 2 is considered to be that ______ link. This is because LANs were traditionally under the administrative control of a single organization.
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The figure shows the function of each layer and the core ______ that can be exploited. Network administrators routinely implement security solutions to protect the ______ in Layer 3 up through Layer 7. They use VPNs, firewalls, and IPS devices to protect these ______. However, if Layer 2 is compromised, then all the layers above it are also affected. For example, if a threat actor with access to the internal network captured Layer 2 frames, then all the security implemented on the layers above would be useless. The threat actor could cause a lot of damage on the Layer 2 LAN networking infrastructure.
The figure shows the function of each layer and the core ______ that can be exploited. Network administrators routinely implement security solutions to protect the ______ in Layer 3 up through Layer 7. They use VPNs, firewalls, and IPS devices to protect these ______. However, if Layer 2 is compromised, then all the layers above it are also affected. For example, if a threat actor with access to the internal network captured Layer 2 frames, then all the security implemented on the layers above would be useless. The threat actor could cause a lot of damage on the Layer 2 LAN networking infrastructure.
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If Layer 2 is compromised, then all the layers above it are also ______. For example, if a threat actor with access to the internal network captured Layer 2 frames, then all the security implemented on the layers above would be useless. The threat actor could cause a lot of damage on the Layer 2 LAN networking infrastructure.
If Layer 2 is compromised, then all the layers above it are also ______. For example, if a threat actor with access to the internal network captured Layer 2 frames, then all the security implemented on the layers above would be useless. The threat actor could cause a lot of damage on the Layer 2 LAN networking infrastructure.
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Security is only as strong as the weakest link in the system, and Layer 2 is considered to be that weak link. This is because LANs were traditionally under the ______ control of a single organization.
Security is only as strong as the weakest link in the system, and Layer 2 is considered to be that weak link. This is because LANs were traditionally under the ______ control of a single organization.
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Study Notes
- The OSI reference model consists of seven layers, with Layer 2 being a weak link in network security.
- LANs were historically under the control of a single organization, making them vulnerable to attacks.
- Layer 2 security threats include MAC table attacks, VLAN attacks, DHCP attacks, ARP attacks, and address spoofing attacks, among others.
- MAC table attacks, such as flooding, can make a switch treat frames as unknown unicasts and flood all incoming traffic.
- Port security, DHCP snooping prevention, dynamic ARP inspection (DAI), and IP source guard (IPSG) are Layer 2 security solutions to prevent various attacks.
- Management protocols must be secured to ensure effectiveness of Layer 2 security solutions.
- Recommended strategies for securing management protocols include using secure variants, out-of-band management networks, dedicated management VLANs, and access control lists (ACLs).
- A MAC address table is a table built by a Layer 2 switch to make forwarding decisions based on source MAC addresses, and it has a fixed size.
- MAC address flooding attacks take advantage of the fixed size of MAC address tables by bombarding the switch with fake source MAC addresses until the table is full.
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Description
Test your knowledge of layer 2 security threats with this quiz, which covers vulnerabilities and concepts related to LAN security, switching, routing, and wireless essentials v7.0 (SRWE). This quiz is based on the Cisco module 10 curriculum.
