To manage the shared buffer space at network ports, slope policies are applied on _________ for the ingress direction, and on ________ or _________ for the egress direction.

Question

Options

• AInterfaces, ports, SAPs
• BPorts, ports, MDAs
• CMDAs, MDAs, ports
• DInterfaces, interfaces. MDAs
• EMDAs, ports, interfaces

• C
  95% (21)
• E
  5% (1)

Explanation

Option C is correct because in Nokia SR OS, slope policies - which use WRED-style mechanisms to manage shared buffer pools - are applied at the MDA (Media Dependent Adapter) level for ingress, since incoming traffic is first handled by the MDA hardware where the shared buffer pool resides. For egress, slope policies can be applied at either the MDA level or the port level, giving operators two granularity options for outbound traffic shaping.

Why the distractors fail:

• A - SAPs are logical service endpoints, not hardware buffer management points; interfaces are L3 constructs, not where shared buffers are controlled.
• B - Reverses the relationship: ports are valid for egress but not for ingress slope policy application.
• D - Interfaces are Layer 3 abstractions; slope policies operate at the hardware/forwarding-plane level (MDAs/ports), not at the interface level.
• E - Gets ingress right (MDA) but lists "interfaces" as an egress option, which is incorrect.

Memory tip: Think "MDAs gate everything IN; MDAs or Ports let it OUT." The MDA is the hardware hub that governs all ingress buffering, while egress gives you a choice - zoom out to MDA or zoom in to individual port.

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