Layer 2 Switch Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The layer 2 switch must have all trunk links enabled statically.
When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings (802.1q or ISL) when a node or interface is restored. While this negoti...Rule Medium Severity -
The layer 2 switch must have the default VLAN pruned from all trunk ports that do not require it.
The default VLAN (i.e., VLAN 1) is a special VLAN used for control plane traffic such as Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggreg...Rule Medium Severity -
The layer 2 switch must have all user-facing or untrusted ports configured as access switch ports.
Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trunk port. Knowing the victim's MAC address and with the victim attached to...Rule Medium Severity -
The layer 2 switch must have the native VLAN assigned to an ID other than the default VLAN for all 802.1q trunk links.
VLAN hopping can be initiated by an attacker who has access to a switch port belonging to the same VLAN as the native VLAN of the trunk link connecting to another switch that the victim is connecte...Rule Medium Severity -
SRG-NET-000512
Group -
SRG-NET-000148
Group -
The layer 2 switch must uniquely identify all network-connected endpoint devices before establishing any connection.
Controlling LAN access via 802.1x authentication can assist in preventing a malicious user from connecting an unauthorized PC to a switch port to inject or receive data from the network without det...Rule High Severity -
SRG-NET-000168
Group -
SRG-NET-000193
Group -
The layer 2 switch must manage excess bandwidth to limit the effects of packet flooding types of denial of service (DoS) attacks.
Denial of service is a condition when a resource is not available for legitimate users. Packet flooding DDoS attacks are referred to as volumetric attacks and have the objective of overloading a ne...Rule Medium Severity
Node 2
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