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Q1. What wireless authentication option requires a Public Key Infrastructure?
A. EAP-TLS
B. PEAP
C. LEAP
D. EAP-FAST
Answer: A
Q2. Which two statements about designing the Data Center Access layer are correct? (Choose two.)
A. Multiport NIC servers should each have their own IP address.
B. Layer 3 connectivity should never be used in the access layer.
C. Layer 2 connectivity is primarily implemented in the access layer.
D. Multiport NIC servers should never be used in the access layer.
E. Layer 2 clustering implementation requires servers to be Layer 2 adjacent.
Answer: C,E
Explanation:
User access is primarily layer 2 in nature, layer 2 clustering is possible only in layer 2 Here is the Explanation: from the Cisco press CCDA certification guide Figure 4-8. Enterprise Data Center Infrastructure Overview
Defining the DC Access Layer
The data center access layer’s main purpose is to provide Layer 2 and Layer 3 physical port density for various servers in the data center. In addition, data center access layer switches provide high-performance, low-latency switching and can support a mix of oversubscription requirements. Both Layer 2 and Layer 3 access (also called routed access) designs are available, but most data center access layers are built using Layer 2 connectivity. The Layer 2 access design uses VLAN trunks upstream, which allows data center aggregation services to be shared across the same VLAN and across multiple switches. Other advantages of Layer 2 access are support for NIC teaming and server clustering that requires network connections to be Layer 2 adjacent or on the same VLAN with one another.
CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 4
Q3. What characteristic separates link state routing protocols from a distance vector?
A. creates a topological view of the entire network
B. path calculation utilizes a more granular metric
C. does not scale well for large networks
D. constantly shares link state updates throughout the topology
Answer: A
Q4. In which phase of PPDIOO are the network requirements identified?
A. Design
B. Plan
C. Prepare
D. Implement
E. Operate
F. Optimize
Answer: B
Explanation:
Plan Phase
The Plan phase identifies the network requirements based on goals, facilities, and user needs. This phase characterizes sites and assesses the network, performs a gap analysis against best-practice architectures, and looks at the operational environment. A project plan is developed to manage the tasks, responsible parties, milestones, and resources to do the design and implementation. The project plan aligns with the scope, cost, and resource parameters established with the original business requirements. This project plan is followed (and updated) during all phases of the cycle.
Q5. Which one of these statements is true concerning the data center distribution (aggregation) layer design?
A. With Layer 3 at the aggregation layer, the physical loops in the topology must still be managed by STP.
B. The boundary between Layer 2 and Layer 3 must reside in the multilayer switches, independent of any other devices such as firewalls or content switching devices.
C. A mix of both Layer 2 and Layer 3 access is sometimes the most optimal.
D. In a small data center, the aggregation layer can connect directly to the campus core, exchanging IP routes and MAC address tables.
Answer: C
Q6. A network engineer is following the Cisco enterprise architecture model. To which network layer would a branch office connect to using a private WAN?
A. Enterprise Campus
B. Enterprise Edge
C. SP Edge Premise
D. Remote Module
Answer: D
Q7. What business trend allows employees to use personal devices to access enterprise data and systems?
A. ISE
B. BYOD
C. SAN
D. IOE
Answer: B
Q8. Which two of these practices are considered to be best practices when designing the access layer for the enterprise campus? (Choose two.)
A. Implement all of the services (QoS, security, STP, and so on) in the access layer, offloading the work from the distribution and core layers.
B. Always use a Spanning Tree Protocol; preferred is Rapid PVST+.
C. Use automatic VLAN pruning to prune unused VLANs from trunked interfaces to avoid broadcast propagation.
D. Avoid wasted processing by disabling STP where loops are not possible.
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
Q9. Which two devices would you place in your DMZ to ensure enterprise edge security? (Choose two.)
A. IPS
B. NAC
C. ASA
D. ACS
E. WCS
Answer: A,C
Q10. With respect to IPv6 addressing, from a design perspective, which of these statements is it important to keep in mind?
A. IPv6 addressing provides convenience of anycast addressing without any configuration requirements.
B. IPv6 does not use multicast addressing.
C. An IPv6 router will not forward packets from one link to other links if the packet has either a link-local source or a link-local destination address.
D. Dynamic address assignment requires DHCPv6.
Answer: C