4A0-C03: Nokia NRS II Composite Exam: IS-IS versionDemo

By Nokia · Question Mode

QuestionQ4

Services Architecture

A service must accept frames with either of the following tag combinations:

  • an outer VLAN tag of 200 and an inner VLAN tag of 33
  • an outer VLAN tag of 250 and an inner VLAN tag of 33

Which SAP(s) must be configured?

  • A 1/1/1:200.*
  • B 1/1/1:*.33
  • C 1/1/1:.
  • D This requires two SAPs: 1/1/1:200.33 and 1/1/1:250.33.
Explanation

On SR OS, a dot1q/QinQ SAP is defined as port:qtag1.qtag2, where a wildcard is permitted for the inner qtag when the outer qtag is explicit, but the outer qtag cannot be wildcarded while the inner tag stays explicit, and a single SAP definition cannot enumerate multiple discrete outer-tag values as alternatives. To accept only frames with outer VLAN 200 combined with inner VLAN 33, and separately outer VLAN 250 combined with inner VLAN 33, two SAPs must be configured — one per outer/inner tag pair — since no single wildcarded SAP expression matches exactly those two combinations without also matching unwanted traffic or missing one of the required outer tags.

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