| V-220623 | | The Cisco switch must uniquely identify and authenticate 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 inje... |
| V-220624 | | The Cisco switch must authenticate all VLAN Trunk Protocol (VTP) messages with a hash function using the most secured cryptographic algorithm available. | VTP provides central management of VLAN domains, thus reducing administration in a switched network. When configuring a new VLAN on a VTP server, the ... |
| V-220625 | | The Cisco 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 distributed DoS (DDoS) attacks are referred to... |
| V-220630 | | The Cisco switch must have Bridge Protocol Data Unit (BPDU) Guard enabled on all user-facing or untrusted access switch ports. | If a rogue switch is introduced into the topology and transmits a BPDU with a lower bridge priority than the existing root bridge, it will become the ... |
| V-220631 | | The Cisco switch must have Spanning Tree Protocol (STP) Loop Guard enabled. | The STP loop guard feature provides additional protection against STP loops. An STP loop is created when an STP blocking port in a redundant topology ... |
| V-220632 | | The Cisco switch must have Unknown Unicast Flood Blocking (UUFB) enabled. | Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN number and the destination ... |
| V-220633 | | The Cisco switch must have DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources. | In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, routers, and servers in the ne... |
| V-220634 | | The Cisco switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports. | IP Source Guard provides source IP address filtering on a Layer 2 port to prevent a malicious host from impersonating a legitimate host by assuming th... |
| V-220635 | | The Cisco switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs. | DAI intercepts ARP requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and befo... |
| V-220638 | | The Cisco switch must implement Rapid Spanning Tree Protocol (STP) where VLANs span multiple switches with redundant links. | STP is implemented on bridges and switches to prevent Layer 2 loops when a broadcast domain spans multiple bridges and switches and when redundant lin... |
| V-220639 | | The Cisco switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections. | In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to be up when there is a mism... |
| V-220640 | | The Cisco 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 n... |
| V-220641 | | The Cisco switch must have all disabled switch ports assigned to an unused VLAN. | A disabled port that is assigned to a user or management VLAN may become enabled by accident or by an attacker and as a result may gain access to that... |
| V-220642 | | The Cisco switch must not have the default VLAN assigned to any host-facing switch ports. | In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices using Sp... |
| V-220643 | | The Cisco 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)... |
| V-220644 | | The Cisco switch must not use the default VLAN for management traffic. | Switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with directly connected switches using Spanning-Tree Protocol (... |
| V-220645 | | The Cisco 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 victi... |
| V-220646 | | The Cisco 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 connectin... |
| V-220629 | | The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches. | Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the switched network. Any sw... |
| V-220636 | | The Cisco switch must have Storm Control configured on all host-facing switchports. | A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm control prevents network ... |
| V-220637 | | The Cisco switch must have IGMP or MLD Snooping configured on all VLANs. | IGMP and MLD snooping provide a way to constrain multicast traffic at Layer 2. By monitoring the IGMP or MLD membership reports sent by hosts within a... |
| V-220647 | | The Cisco switch must not have any switchports assigned to the native VLAN. | 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 victi... |
