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Assessment Title
Rule Text
The Juniper EX switch must be configured to set all enabled user-facing or untrusted ports as access interfaces.
Description
Discussion Text
By default, unconfigured (or expressly disabled) Junos interfaces are unusable. Any enabled interface configured with the family ethernet-switching uses interface-mode access by default, which meets this requirement. Trunked interfaces must be explicitly configured for operational requirements (e.g., interswitch links), which makes them trusted and not user-facing.
Configuring enabled user-facing or untrusted interfaces as trunked may expose network traffic to an unauthorized, or unintended, connected endpoint. Access interfaces can belong to a single VLAN rather than the multiple VLANs supported by trunks, which limits potential exposure to a smaller subset of the total network traffic.
Access interfaces also behave differently than trunked interfaces, especially with respect to control plane traffic. For example, access interfaces can be marked as "edge" for protocols like Rapid Spanning Tree (RSTP) or Multiple Spanning Tree (MSTP) where specific protections can be applied to prevent the switch from accepting Bridge Protocol Data Units (BPDU) from unauthorized sources and causing a network topology change or disruption. Additionally, network level protection mechanisms, like 802.1x or sticky-mac, are applied to access interfaces and these protection mechanisms help prevent unauthorized network access.
Configuring enabled user-facing or untrusted interfaces as trunked may expose network traffic to an unauthorized, or unintended, connected endpoint. Access interfaces can belong to a single VLAN rather than the multiple VLANs supported by trunks, which limits potential exposure to a smaller subset of the total network traffic.
Access interfaces also behave differently than trunked interfaces, especially with respect to control plane traffic. For example, access interfaces can be marked as "edge" for protocols like Rapid Spanning Tree (RSTP) or Multiple Spanning Tree (MSTP) where specific protections can be applied to prevent the switch from accepting Bridge Protocol Data Units (BPDU) from unauthorized sources and causing a network topology change or disruption. Additionally, network level protection mechanisms, like 802.1x or sticky-mac, are applied to access interfaces and these protection mechanisms help prevent unauthorized network access.
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