9.2.5 Network Pro Practice Questions

What are other names for a VoIP server? (Select two.) Jitter Hard phone IP-PBX VoIP PBX QoS

IP-PBX VoIP PBX

Which of the following features is used with digital IP phones to supply power through a switch port? PoE Spanning tree Trunking VPN 802.1x

Power over Ethernet (PoE)

Which switch features are typically used with VoIP? (Select two.) PoE Mirroring Spanning tree VLAN

Power over Ethernet (PoE) Virtual LAN (VLAN)

What is a soft phone? A device that converts fax calls and other soft calls between the PSTN and an IP network. A software algorithm that compresses VoIP data prior to transmission on an IP network. A traditional or VoIP phone that has a padded handset that is more comfortable for a user. A software application that runs on a computer or other device that accesses a VoIP server to make real-time phone calls.

A software application that runs on a computer or other device that accesses a VoIP server to make real-time phone calls.

Your company uses VoIP for phone calls. Recently, employees have been complaining about phone calls with unusual sound effects. Which type of problem is occurring on the VoIP system? Jitter Packet loss Latency Echo

Jitter

You are on a phone call using VoIP. You notice that it takes several seconds for the person on the other end to respond to questions you ask. Which type of problem is occurring? Latency Echo Jitter Packet loss

Latency

What is one benefit of placing VoIP gateways in geographically separated branch offices that have an existing WAN connection? Long-distance PSTN charges can be reduced by switching VoIP calls to the PSTN in locations where only local call charges would be incurred. Data can be transported between VoIP gateways over the PSTN instead of via the expensive WAN. VoIP gateways can aggregate multiple VoIP calls for more efficient transmission to the home office. Less costly VoIP gateways can be used in place of expensive routers and modems to provide WAN connectivity.

Long-distance PSTN charges can be reduced by switching VoIP calls to the PSTN in locations where only local call charges would be incurred.

How can QoS be configured so that large data transfers will not block VoIP calls by using too much network bandwidth? QoS can be configured on network devices to only allow network protocols that throttle network bandwidth usage. QoS can be configured on network devices to set a bandwidth threshold on selected ports. QoS can be configured on network devices to limit the size of a file that can be transferred on the network. QoS can be configured on network devices to give priority to VoIP traffic.

QoS can be configured on network devices to give priority to VoIP traffic.

Which of the following protocols is an open source protocol used by most manufacturers of VoIP systems? User datagram protocol (UDP) Session initiation protocol (SIP) Stream control transmission protocol (SCTP) Transmission control protocol (TCP)

Session initiation protocol (SIP)

Which of the following protocols is used by VoIP to set up, maintain, and terminate a phone call? SIP RTP NTP TLS SSH

Session initiation protocol (SIP)

Upper management has asked you if there is a way to integrate phone calls, emails, and instant messaging into a single platform. Which of the following systems should you recommend? PSTN Quality of service Voice over IP Unified communication

Unified communication

Which VoIP device helps establish the connection between two VoIP phones? VoIP codec VoIP endpoint VoIP server VoIP gateway

VoIP server

When would you consider changing the codec used in your VoIP system? (Select two.) When excessive jitter causes unusual sound effects in VoIP calls. When VoIP data consumes too large a portion of your network bandwidth. When network latency causes callers to talk over each other. When sound quality is poor. When an open source VoIP protocol requires a different codec.

When VoIP data consumes too large a portion of your network bandwidth. When sound quality is poor.