READ Free Dumps For Cisco- 400-051
| Question ID 12897 | What is the minimum number of TCP sessions needed to complete a H.323 call between
two H.323 gateways using slow start?
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| Option A | 0
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| Option B | 1
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| Option C | 2
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| Option D | 3
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| Option E | 4
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| Correct Answer | C |
Explanation Explanation: H.323 has two modes of operation: slow start and fast start. The initiation of a call may proceed in a slow start or fast start in H.323. In a slow start, H.323 signaling consists of Setup, Call Proceeding, Alerting, and Connect steps. After these steps, the H.245 media negotiation is performed. When a call is initiated in H.323 fast start, the H.245 media negotiation is performed within the initial Setup message. With slow start, multiple TCP connections are needed for an H.323 call, such as one H.225 signaling channel and one H.245 signaling channel if required (minimum of these two).
| Question ID 12898 | Which RAS message is used between two gatekeepers to resolve an alias address?
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| Option A | GRQ
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| Option B | ARQ
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| Option C | IRQ
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| Option D | LRQ
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| Option E | RRQ
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| Correct Answer | D |
Explanation Explanation: LRQ These messages are exchanged between gatekeepers and are used for inter-zone (remote zone) calls. For example, gatekeeper A receives an ARQ from a local zone gateway requesting call admission for a remote zone device. Gatekeeper A then sends an LRQ message to gatekeeper B. Gatekeeper B replies to the LRQ message with either a Location Confirm (LCF) or Location Reject (LRJ) message, which depends on whether it is configured to admit or reject the inter-zone call request and whether the requested resource is registered.