Which two techniques can reduce voice packet transfer delay across a link of less than 512 kbps? (Choose two.)
A. deploy LFI
B. increase link bandwidth
C. extend the trust boundary
D. deploy software compression
E. increase queue depth
Correct Answer: AB
Section: Voice Video Explanation
Table. Link-Efficiency Mechanisms
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 6
Your company uses OSPF for internal routing. The company will be connected to VendorA via a single dedicated link and to VendorB via redundant dedicated links. Both vendors also use OSPF for internal routing. Which of the following deployments describes the best intra-domain routing practice in this situation?
A. Redistribute the routes on each link between your company and the vendors to a shared EIGRP routing protocol.
B. Use IBGP to reach VendorA and EBGP to reach VendorB.
C. Use static routes to reach VendorA and EBGP to reach VendorB.
D. Use static routes to reach both VendorA and VendorB.
E. Connect your company to both VendorA and VendorB using existing OSPF.
Correct Answer: C
Section: Routing Explanation
Which statement can a network designer use to describe route summarization to an IT manager?
A. It is the grouping of ISP network addresses to minimize the number of routes to the Internet.
B. It is the grouping of multiple discontiguous subnets to increase routing performance.
C. It is the grouping of multiple contiguous networks and advertising as one large network.
D. It is the grouping of multiple contiguous subnets into one Class A, B, or C IP address to minimize routing table size.
Correct Answer: C
Section: Routing Explanation
Refer to the exhibit. All primary links are T1s. The customer wants to have a backup to each remote office from the Headquarters office.
Which two types of backup links would be viable solutions? (Choose two.)
A. dial backup routing
B. shadow SVC
C. permanent secondary WAN link
Correct Answer: AC
Section: WAN VPN Explanation
WAN Backup Design
Redundancy is critical in WAN design for the remote site because of the unreliable nature of WAN links, when compared to LANs that they connect. Most enterprise edge solutions require high availability between the primary and remote site. Because WAN links have lower reliability and lack bandwidth, they are good candidates for most WAN backup designs. Branch offices should have some type of backup strategy in the event of a primary link failure. Backup links can be either dialup, permanent WAN, or Internet-based connections.
WAN backup options are as follows:
Dial backup: ISDN provides backup dialup services in the event of a primary failure of a WAN circuit. The backup link is initiated if a failure occurs with the primary link. The ISDN backup link provides network continuity until the primary link is restored, and then the backup link is terminated such as with floating static route techniques.
Secondary WAN link: Adding a secondary WAN link makes the network more fault tolerant. This solution offers two key advantages:
Backup link: Provides for network connectivity if the primary link fails. Dynamic or static routing techniques can be used to provide routing consistency during backup events. Application availability can
also be increased because of the additional backup link.
Additional bandwidtH. Load sharing allows both links to be used at the same time, increasing the available bandwidth. Load balancing can be achieved over the parallel links using automatic routing protocol techniques.
Shadow PVC. SPs can offer shadow Frame Relay PVCs, which provide additional PVCs for use if needed. The customer is not charged for the PVC if it does not exceed limits set by the provider while the primary PVC is available. If the limit is exceeded, the SP charges the customer accordingly.
IPsec tunnel across the Internet: An IPsec VPN backup link can direct redirect traffic to the corporate headquarters when a network failure has been detected.
A Cisco SONA architecture layer is described as follows:
The layer’s IT resources are interconnected across a converged network foundation.
The layer’s IT resources include servers, storage, and clients. The layer represents how resources exist
across the network.
The customer objective for the layer is to have anywhere/anytime connectivity. Which Cisco SONA
architecture layer is being described?
B. Integrated Transport
D. Networked Infrastructure
E. Interactive Services
Correct Answer: D
Section: Design Explanation
The SONA framework define the following three layers:
Networked Infrastructure layer: Where all the IT resources interconnect across a converged network foundation. The objective of this layer is to provide connectivity, anywhere and anytime.
Interactive Services layer: Includes both application networking services and infrastructure services. This layer enables efficient allocation of resources to applications and business processes delivered through the
Application layer: Includes business applications and collaboration applications. The objective of this layer is to meet business requirements and achieve efficiencies by leveraging the Interactive Services layer.
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