CCNA VOIP Ch 10
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What are two reasons to elimate IP Phone reliance on DNS?
Elimination of single point failure
Reduction of delay caused by name resolution lookups
Which of the following is true regarding call flows in CUCM? (choose 2)
a. Signaling traffic using RTP is sent directly to the CUCM from the IP Phone.
b. Signaling traffic using SCCP/SIP is sent directly to the CUCM from the IP phone.
c. Voice bearer stream traffic flows through the CUCM server to maintain QOS policy.
d. Voice bearer stream traffic flows direct from phone to phone.
b and d
Which of the following is true of SRST?
a. SRST allows IP phones in a branch to be controlled by the local router int the event that WAN failure causes a loss of connectivity to the CUCM.
b. SRST performs dynamic gateway services, allowing keepalives and signaling to be sent over the backup PSTN link.
c. the NM-SRSST module is supported on the 2900 and 3900 series ISR platforms only.
d. SRST is alegacy feature; the replacement set is called Serivce Advertisement Framework.
Call admission (CAC) serves what purpose?
Prevents oversubsrciption of IP WAN voice BW by dropping calls that exceed the configured voice queue size.
Which of the following is the only event that will trigger AAR?
a. WAN failure
b. CFUR rejection
c. SRST registration
d. Local Route Group failure
e. CAC call rejection
What is AAR?
- Automatic Alternate Routing, triggered only by CAC.
- CAC is Call Admission Control. It monitors # of phone calls against BW allotted, and when BW is exceeded, it drops the extra calls, unless AAR is in place. AAR routes the extra calls over the PSTN.
Which of the following is the correct order of configuration of call-routing components?
a. Device, Route Group, Route List, Route Pattern
b. Route Pattern, Route List, Route Group, Device
c. Route Pattern,Route Group, Route List, Device
d. Route Group, Device,Route Pattern, route List
- Just remember-----
- configuration is:
- Device, Group, List, Pattern
- Call flow is:
- Pattern, List, Group, Device
Which two of the following signaling methods provide digit-by-digit analysis?
a. SIP en-bloc
b. MGCP en-bloc
c. SIP using station dial rules
d. SIP using CUCM dial rules
f. SIP using KPML
Which of the following are line group distro algorithms? Choose all that apply.
a. First-in, First-out
c. Directed Broadcast
e. Longest Idle
- b d e f
- Remember BLTC (mnemonic)
- Bacon Lettuce Tomato Cucumber
- Broadcast Longest Idle Top-down Circular
Which of the following is true?
a. No Partitions or search spaces exist by default in a CUCM installation.
b. One Partition exists by default; it is named “default”.
c. Only the default CSS has access to the default Partition.
d. All CSSs have access to the default Partition.
Which statement is true regarding Calling Search Space (CSS)?
a. If a CSS is applied to a phone, it overrides the CSS on the line.
b. If a CSS is applied to a line, it invalidates the CSS on the phone.
c. If a CSS is applied to a line, it overrides the CSS applied to the phone.
d. If a CSS is applied to a phone, a CSS cannot be applied to the line.
Describe the call routing components.
Pattern - a string of dialed digits.
List - an ordered list of route groups.
Group - a list of gateways and trunks (aka devices) that are configured to support circuits.
Devices - physical terminations that suppeot circuits to the PSTN.
Define digit by digit analysis.
Digits are collected one at a time while dialed and matched against the route pattern. The closest match wins.
SCCP and SIP w/ KPML are digit by digit.
Define Class of Control.
the ability to apply calling restrictions to devices.
ex. prevent specific pers from long distance calls.
routing a specific number to different targets based on time of day.
routing a specific number to different targets at various locations.
Detail partions and Calling Search Spaces in CUCM.
Partition - a group of things that are alike. (DNs, Route pattern, etc)
CSS - a top-down ordered list of Partitions. A CSS can be applied to a device (ip phone or gateway) or to a line.
One CSS exists by default and contains the Null Partition. (Null is default name of default partition.
Know this: if the target being called does not exist in one of the Partitions in the CSS of the caller, the call will fail.
If both phone and line are in different CSSs, which takes precedence?
The line partition. The partitions in both CSSs are concatenated in top-down order.
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