Question 187 of 240 from exam 400-351: CCIE Wireless Written Exam

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Question

Refer to the exhibit.

Looking at the packet capture between the client and AP during a voice troubleshooting session, what can you learn?

$® Frame 8990: 238 bytes on wire (1004 bits), 238 bytes captured (1904 bits) 02.11 radio Information © TEEE 802.11 gos vata, Flags: « ‘Type/Subtype: Gos bata (0x28) w Frame Cortrol: 0x0188 (Norma) uration: 44 BSS Ids clsco_A8:easb1 Cod: Fe:7F+48+e2:b:) Source acdress: apple_te: ¢ Destination address: cisco? Fragrent number: 0 Sequence number? 2472 = Frane check seqlence: oxoo000000 Clncorrect, should be oxboozesta) 5 ges contro Priority: 5 (video) (video) 0.1. = Qos bit 4: Bfts 8-15 of Qos Control Field are THoP ouratten Requested ‘ack policy: Normal Ack 0x00) Payloac Type: MSOU ‘TwoP curation Requested: no TOP requested (0) ® Koghcal-Ltrk control B Internet Protocol, sre: 172,21.81.243 (172,21. 51.243), Ost: 172,21.51.239 (472.21. 51.239) version: 4 ferentiaved services Fleldt Ox08 (OScP Oxzer Exoedited Forwarding? EON: 0x00) Total Lergth: 200 Identification: Oxtedt (7892) @ Flags: www Fragment offset: 0 Tine to Vive: 64 Protocol: uoP (7) @ Header checksum: 0x0a8¢ [correct] Source: 172.22, 51.243 (472.22. $1,243) Destination: 172.32, 51.239 (72.24, $1.239) User Datagram Protocol, Src port: 17386 (17386),/Ost Port 18406 (8405) Real-Time Transport Protocol (stream setup by soP (frame 6984) 20. ‘= Version: RFC 1889 version (2) Padding: False = extension: False 0006 = coner‘ibuting source Adentifters count: 0 Ont) vee. Imarker: False Payload type: ITU-T G. 711 PomU (0) Sequence number: 5994 Terrendee sequence number: 71530] Timestane: 3686765780 Synchronization Source ‘dent {fier: 0x797ea839 (2038343737) 98 00 40 343 bo be i be ee de a ta 7 Ea a oa 52 2 et Sa Ea$

Answers

A. The 802.1p COS value is marked as 5, which typically is used for the voice traffic that is encoded in G711.

B. IP precedence is marked as 5 for the voice traffic that is encoded in G711, with a corresponding 802.11e UP marking of 6.

C. The WMM UP value is marked as 5, which typically is used for the voice traffic that is encoded in G711, and DSCP is marked as E.

D. IP precedence is marked as 5, with a corresponding 802.11e UP marking of 6 and a correct DSCP marking to EF; the voice traffic is encoded in G711.

E. The 802.1p COS value is marked as 5, with a correct DSCP marking to EF, and the voice traffic is encoded in G711.

F. WMM UP marking is marked as 5, which typically is used for video traffic; this voice traffic stream is encoded in G711, and DSCP is marked as E.

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Explanations

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A. B. C. D. E. F.

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