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NEW QUESTION: 1

A. Option B
B. Option D
C. Option A
D. Option C
Answer: C

NEW QUESTION: 2
What is a wide-area network (WAN)?
A. A network that encompasses an entire city or metropolitan area and connects multiple local- area networks (LANs)
B. A network that connects client devices wirelessly using radio waves
C. A network that crosses metropolitan, regional, or national boundaries
D. A network that is restricted to a single building, a group of buildings, or even a single room
Answer: C
Explanation:
Section: (none)

NEW QUESTION: 3
Which two of these practices are considered to be best practices when designing the access layer for the enterprise campus? (Choose two.)
A. Use automatic VLAN pruning to prune unused VLANs from trunked interfaces to avoid broadcast propagation.
B. Always use a Spanning Tree Protocol; preferred is Rapid PVST+.
C. Avoid wasted processing by disabling STP where loops are not possible.
D. Implement all of the services (QoS, security, STP, and so on) in the access layer, offloading the work from the distribution and core layers.
E. Use VTP transparent mode to decrease the potential for operational error.
Answer: B,E
Explanation:
When designing the building access layer, you must consider the number of users or ports
required to size up the LAN switch. Connectivity speed for each host should also be
considered. Hosts might be connected using various technologies such as Fast Ethernet,
Gigabit Ethernet, or port channels. The planned VLANs enter into the design.
Performance in the access layer is also important. Redundancy and QoS features should
be considered.
The following are recommended best practices for the building access layer:
Limit VLANs to a single closet when possible to provide the most deterministic and highly available topology.
Use Rapid Per-VLAN Spanning Tree Plus (RPVST+) if STP is required. It provides the faster convergence than traditional 802.1d default timers.
Set trunks to ON and ON with no-negotiate.
Manually prune unused VLANs to avoid broadcast propagation (commonly done on the distribution switch).
Use VLAN Trunking Protocol (VTP) Transparent mode, because there is little need for a common VLAN database in hierarchical networks.
Disable trunking on host ports, because it is not necessary. Doing so provides more security and speeds up PortFast.
Consider implementing routing in the access layer to provide fast convergence and Layer
3 load balancing.
Use the switchport host commands on server and end-user ports to enable PortFast and disable channeling on these ports.
Use Cisco STP Toolkit, which provides
PortFast: Bypass listening-learning phase for access ports
Loop GuarD. Prevents alternate or root port from becoming designated in absence of bridge protocol data units (BPDU)
Root GuarD. Prevents external switches from becoming root
BPDU GuarD. Disables PortFast-enabled port if a BPDU is received Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 3, Page 85

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