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NEW QUESTION 20
When provisioning bandwidth for an IP telephony network, which elements are unique to an IP telephony call?
(Choose two.)

• A. call-control signaling
• B. voice stream
• C. speed of the segment to the telephone
• D. routing protocol packets
• E. IGMP packets

Answer: A,B
Explanation:
Bandwidth provisioning for an IP telephony call consists of the voice stream traffic and the call control traffic.
These elements are unique to an IP telephony call.
The network infrastructure should be examined to see if the required bandwidth exists to support the voice and call-control applications. The sum of the bandwidth necessary for each major application, including voice, video, and data, should not exceed 75% of the total available bandwidth for each link. Voice traffic can be characterized as:
Smooth
Benign
Drop sensitive
Delay sensitive
Voice packets are typically around 60 to 120 bytes in size. For good voice quality, packet loss should be less than 1 percent and delay should be no more than 150 ms.
The IP telephony voice call-control procedures also generate traffic. The call control procedures are in the areas of call setup, maintenance, redirect, and tear down. There are special protocols such as H.323 and Media Gateway Control Protocol (MGCP) that handle these procedures.
Voice applications are delay-sensitive. Speech is sampled by voice processors referred to as a codec (coder/ decoder). Then the digitized voice-sample outputs of the codecs are sent into the network towards the receiver at regular intervals in real-time transport protocol (RTP) packets. If these packets containing the voice samples are delayed for any reason behind other data traffic, the quality of the voice conversation suffers.
The transportation of these voice applications in RTP packets through the IP network handled by H.323 protocols and devices is referred to as Voice over IP (or VoIP for short).
The following are other network and design considerations besides bandwidth relating to IP telephony infrastructure support:
Determine if the cabling plant can support the IP telephony equipment.
Determine if the switch hardware can supply power to attached IP telephony equipment or if additional hardware is required.
Ensure that infrastructure supports priority end-to-end VLANs and QoS networking.
Internet Group Management Protocol (IGMP) is used for managing the membership of IP multicast groups and is not an element unique to an IP telephony call.
Routing protocol packets (RIP, OSPF, and EIGRP) are used by routers to share routing information, and are not elements unique to an IP telephony call.
The speed of the segment to the telephone is important to VoIP, but that is not an element unique to an IP telephony call.
Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify VLANs
References:
Cisco > Support > Technology Support > Voice > Telephony Signaling
 
NEW QUESTION 21
Which two statements about VRRP object tracking are true? (Choose two)

• A. A VRRP group can track only one object at a time
• B. VRRP supports only interce tracking
• C. The VRRP interface priority must be manually configured by the administrator
• D. The priority of a VRRP device can change in accordance with the up or down status of a VRRP object
• E. VRRP can track the status of interfaces and routes

Answer: D
 
NEW QUESTION 22
Which node performs the LISP Map-Server and Map-Resolver functions in the Cisco SD-Access network architecture?

• A. border node
• B. fabric edge node
• C. control plane node
• D. intermediate node

Answer: C
 
NEW QUESTION 23

Refer to the exhibit. An engineer is designing an OSPF network for a client. Requirements dictate that the routers in Area 1 should receive all routes belonging to the network, including EIGRP, except the ones originated in the RIP domain. Which action should the engineer take?

• A. Make area 1 a stub.
• B. Make the area 1 routers part of area 0.
• C. Make area 1 a NSSA.
• D. Make area 1 a standard OSPF area.

Answer: C
Explanation:

 
NEW QUESTION 24
Refer to the exhibit.

An engineer must design a WAN solution so that ISP-1 is always preferred over ISP-2. The path via ISP-2 is considered as a backup and must be used only when the path to ISP-1 is down. Which solution must the engineer choose?

• **A. R1:

• Routes advertised to ISP-1: 0x AS-path prepend
• Routes received from ISP-1: HIGH local-preference
• Routes advertised to R2: community NO-EXPORT
• Routes received from R2: no action
  R2:
• Routes advertised to ISP-2: 5x AS-path prepend
• Routes received from ISP-2: LOW local-preference
• Routes advertised to R1: no action
• Routes received from R1: no action**

• B. R1:

• Routes advertised to ISP-1: 0x AS-path prepend
• Routes received from ISP-1: LOW local-preference
• Routes advertised to R2: community NO-ADVERTISE
• Routes received from R2: no action
  R2:
• Routes advertised to ISP-2: 5x AS-path prepend
• Routes received from ISP-2: HIGH local-preference
• Routes advertised to R1: no action
• Routes received from R1: community NO-ADVERTISE

• C. R1:

• Routes advertised to ISP-1: 5x AS-path prepend
• Routes received from ISP-1: LOW local-preference
• Routes advertised to R2: community NO-ADVERTISE
• Routes received from R2: no action
  R2:
• Routes advertised to ISP-2: 0x AS-path prepend
• Routes received from ISP-2: HIGH local-preference
• Routes advertised to R1: community NO-EXPORT
• Routes received from R1: no action

• D. R1:

• Routes advertised to ISP-1: 0x AS-path prepend
• Routes received from ISP-1: HIGH local-preference
• Routes advertised to R2: no action
• Routes received from R2: community NO-EXPORT
  R2:
• Routes advertised to ISP-2:5x AS-path prepend
• Routes received from ISP-2: LOW local-preference
• Routes advertised to R1: community NO-ADVERTISE
• Routes received from R1: no action

Answer: A
 
NEW QUESTION 25
......