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I - Mission Critical Public

Rules and Groups employed by this XCCDF Profile

  • SRG-NET-000362-L2S-000021

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  • The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches and hosts.

    Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the switched network. Any switch can be the root bridge in a network. Howev...
    Rule Low Severity
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  • SRG-NET-000362-L2S-000022

    Group
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  • The Cisco switch must have BPDU Guard enabled on all user-facing or untrusted access switch ports.

    If a rogue switch is introduced into the topology and transmits a Bridge Protocol Data Unit (BPDU) with a lower bridge priority than the existing root bridge, it will become the new root bridge and...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000023

    Group
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  • The Cisco switch must have STP Loop Guard enabled.

    The Spanning Tree Protocol (STP) loop guard feature provides additional protection against STP loops. An STP loop is created when an STP blocking port in a redundant topology erroneously transition...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000024

    Group
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  • 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 MAC address of the frame. When a router has an ...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000025

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  • 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 network. Host ports and unknown DHCP servers are ...
    Rule Medium Severity
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Node 2

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