800-150 Exam Results

These components are part of theCisco Collaboration System Architecture (CSA), and are reviewed in theFLDTEC trainingunderCisco Equipment and Collaboration Basics:

Call Control: Managed by services likeCisco Unified Communications Manager (CUCM), it routes and connects calls.

Collaboration Applications: Provide added value services such asvoicemail (Unity),messaging (IM&P), presence, and more.

Edge Devices: IncludeCisco ExpresswayandCUBE(Cisco Unified Border Element), offering secure access and traversal for mobile/remote endpoints.

Conferencing: Powered by platforms likeCisco Meeting ServerorWebex, enabling multi-party conferencing.

Endpoints: Include bothhardware (IP phones, video units)andsoftware (Webex app)that users interact with directly.

In enterprise networking, remote sites or branch offices connect to the central campus network using:​

WAN Links:These are dedicated communication paths that connect geographically dispersed networks. WAN links can be leased lines, MPLS circuits, or other forms of long-distance connectivity that facilitate reliable data transmission between remote sites and the main campus.​

IPsec VPN Tunnels:Internet Protocol Security (IPsec) VPNs provide secure, encrypted tunnels over the public internet, allowing remote sites to connect to the enterprise network securely. This method is cost-effective and widely used for connecting branch offices to the central network infrastructure.​

Access layer switches (Option A) and LAN core switches (Option E) are components within a local network and do not facilitate remote connectivity. Ad hoc Wi-Fi networks (Option D) are temporary and lack the security and reliability required for enterprise-level remote connections.​

When addressing call quality issues between IP phones, theReal-time Transport Protocol (RTP)is the primary protocol to analyze. RTP is responsible for the actual transmission of voice data during a call, and its performance directly impacts call quality.​

Key factors affecting RTP and, consequently, call quality include:​

Packet Loss:Missing packets can lead to audio gaps.

Jitter:Variations in packet arrival times can cause choppy audio.

Latency:Delays in packet delivery can result in noticeable lag.​

Analyzing RTP streams allows technicians to identify these issues and implement appropriate Quality of Service (QoS) measures to mitigate them.​

Incontrast:​

SIP (Session Initiation Protocol):Handles call setup, modification, and teardown but not the media stream.

SCCP (Skinny Client Control Protocol):A Cisco proprietary protocol for signaling, not media transport.

H.323:An older protocolsuite for multimedia communication, encompassing both signaling and media, but less commonly used in modern IP telephony.​Reference:Supporting Cisco Devices for Field Technicians (FLDTEC) – Troubleshooting Methodologie

TheFLDTECtraining describes theTCP/IP encapsulationas a step-by-step process where data is passed down through the layers of the TCP/IP model:

Application Layer: User data is created (email, file, request) and the application layeradds the application header, creating a data payload.

Transport Layer: The data is segmented. Each segment receives a transport-layer header (TCP/UDP), enabling proper sequencing and error handling at the destination.

Internet Layer: Segments are encapsulated intopackets(IP datagrams), with an IPheader added to facilitate routing between networks.

Link Layer: Finally, packets are framed with Layer 2 headers and trailers (including theFrame Check Sequencefor error detection), creating aframeready to be transmitted on the physical medium.

This layered encapsulation ensuresinteroperabilityandtroubleshooting clarity, which is why it is emphasized inFLDTEC’s IOS Software Basics module.