Best Way To Study For Cisco 300-420 Exam Brilliant 300-420 Exam Questions PDF
Updated Verified Pass 300-420 Exam - Real Questions & Answers
NEW QUESTION 38
An engineer is looking for a standards-driven YANG model to manage a multivendor network environment.
Which model must the engineer choose?
- A. IEEE NETCONF
- B. IETF
- C. Native
- D. OpenConfig
Answer: B
Explanation:
Section: Automation
NEW QUESTION 39
An engineer must propose a QoS architecture model that allows an application to inform the network of its traffic profile and to request a particular type of service to support its bandwidth and delay requirements. The application requires consistent and dedicated bandwidth end to end. Which QoS architecture model meets these requirements?
- A. IntServ
- B. LLQ
- C. WRED
- D. DiffServ
Answer: A
NEW QUESTION 40
An engineer must design an in-band management solution for a customer with branch sites. The solution must allow remote management of the branch sites using management protocols over an MPLS WAN. Queueing is implemented at the remote sites using these classes:
How must the solution prioritize the management traffic over the WAN?
- A. Mark the traffic with DSCP EF and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2.
- B. Mark the traffic with DSCP CS1 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to CIass3.
- C. Mark the traffic with DSCP CS2 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to Class3
- D. Mark the traffic with DSCP CS6 and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2
Answer: A
NEW QUESTION 41
An engineer is working for a large cable TV provider that requires multiple sources streaming video on different channels using multicast with no rendezvous point. Which multicast protocol meets these requirements?
- A. PIM-SSM
- B. BIDIR-PIM
- C. PIM-SM
- D. any-source multicast
Answer: A
NEW QUESTION 42
When designing interdomain multicast, which two protocols are deployed to achieve communication between multicast sources and receivers? (Choose two.)
- A. IGMPv2
- B. MP-BGP
- C. BIDIR-PIM
- D. MSDP
- E. MLD
Answer: B,D
NEW QUESTION 43 
Refer to the exhibit. The distribution switches serve as the layer 3 boundary. HSRP preemption is enabled.
When the primary switch comes back after a failure, traffic is initially dropped. Which solution must be implemented to improve the design?
- A. Use the preempt delay feature on the primary HSRP device.
- B. Use the preempt delay feature on the backup HSRP device
- C. Configure a higher mac-refresh interval on both HSRP devices
- D. Increase the hello timers on both HSRP devices
Answer: A
NEW QUESTION 44
What is the function of the multicast Reverse Path Forwarding check?
- A. It is used to discover and announce RP-set information.
- B. It allows for a loop-free distribution tree from the source to receivers.
- C. It prevents bootstrap messages from reaching all routers.
- D. It serves as an Auto RP Mapping agent.
Answer: B
NEW QUESTION 45
What is the role of a control-plane node in a Cisco SD-Access architecture?
- A. map system that manages External Layer 3 networks
- B. fabric device that connects wired endpoints to the SD-Access fabric
- C. fabric device that connects APs and wireless endpoints to the SD-Access fabric
- D. map system that manages endpoint to device relationships
Answer: D
NEW QUESTION 46
Which statement describes what happens if all VSL connections between the virtual switch members are lost?
- A. The virtual switch members reload.
- B. The VSS transitions to the dual active recovery mode, and only the new active virtual switch continues to forward traffic.
- C. The VSS transitions to the dual active recovery mode, and both virtual switch members continue to forward traffic independently.
- D. Both virtual switch members cease to forward traffic.
Answer: B
Explanation:
Q. What happens if all VSL connections between the virtual switch members are lost?
A. VSLs can be configured with up to eight links between the two switches across any combination of line cards or supervisor ports to provide a high level of redundancy. If for some rare reason all VSL connections are lost between the virtual switch members leaving both the virtual switch members up, the VSS will transition to the dual active recovery mode.
The dual active state is detected rapidly (subsecond) by any of the following three methods:
Enhancement to PagP used in MEC with connecting Cisco switches
L3 Bidirectional Forwarding Detection (BFD) configuration on a directly connected link (besides VSL) between virtual switch members or through an L2 link through an access layer switch L2 Fast-Hello Dual-Active Detection configuration on a directly connected link (besides VSL) between virtual switch members (supported with 12.2(33)SXI) In the dual active recovery mode, all interfaces except the VSL interfaces are in an operationally shut down state in the formerly active virtual switch member. The new active virtual switch continues to forward traffic on all links.
Reference: http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9336/ prod_qas0900aecd806ed74b.html
NEW QUESTION 47
Which design consideration must be made when using IPv6 overlay tunnels?
- A. Overlay tunnels should only be considered as a transition technique toward a permanent solution.
- B. Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.
- C. Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.
- D. Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.
Answer: C
NEW QUESTION 48
Refer to the exhibit.
When troubleshooting a network problem, a network analyzer is connected to Port f0/1 of a LAN switch. Which command can prevent BPDU transmission on this port?
- A. spanning-tree bpduguard default
- B. no spanning-tree link-type shared
- C. spanning-tree portfast bpdufilter default
- D. spanning-tree portfast bpduguard enable
Answer: C
Explanation:
Explanation/Reference:
NEW QUESTION 49
Refer to the exhibit. Which two solutions maximize the use of the links between the core and distribution layers? (Choose two.)
- A. use an IGP
- B. use multiple unequal-cost links
- C. use HSRP
- D. use R-PVSTP+
- E. use multiple equal-cost links
Answer: A,E
NEW QUESTION 50
An engineer must design a solution to connect a customer to the Internet. The solution will include a Layer 3 circuit with a CIR of 50 Mbps from the service provider. The hand-off from the provider's switch to the customer's router is 1Gbps. Which solution should the engineer include to prevent potential issues with choppy voice traffic?
- A. Reduce the bandwidth of the connection to the router.
- B. Add a bandwidth statement to the router interface.
- C. Implement hierarchical QoS with a parent shaping policy.
- D. Implement hierarchical QoS with a parent policing policy.
Answer: C
Explanation:
Section: WAN for Enterprise Networks
NEW QUESTION 51
Which two best practices must be followed when designing an out-of-band management network? (Choose two.)
- A. Ensure network isolation
- B. Ensure that the management network is a backup to the data network
- C. Enforce access control
- D. Back up data using the management network
- E. Facilitate network integration
Answer: A,C
NEW QUESTION 52
Drag and drop the description from the left onto the corresponding WAN connectivity types and categories on the right.
Answer:
Explanation:
NEW QUESTION 53 
Refer to the exhibit. An engineer is designing a BGP solution for a client that peers with ISP1 for full Internet connectivity and with ISP2 for direct exchange of routes for several third parties. Which action, when implemented on the edge routers, enables the client network to reach the Internet through ISP1?
- A. Advertise a default route for downstream routers within the client network.
- B. Run an eBGP session within different VRFs for each ISP.
- C. Apply the AS-path prepend feature for ISP2.
- D. Apply route filtering such that the client advertises only routes originated from its own AS.
Answer: A
NEW QUESTION 54
Refer to the exhibit. The connection between SW2 and SW3 is fiber and occasionally experiences unidirectional link failure. An architect must optimize the network to reduce the change of layer2 forwarding loops when the link fails. Which solution should the architect include?
- A. Utilize root guard on SW1.
- B. Utilize 8PDU filter on SW3.
- C. Utilize BPDU guard on SW1
- D. Utilize loop guard on SW2
Answer: D
NEW QUESTION 55
Which consideration must be taken into account when using the DHCP relay feature in a Cisco SD-Access Architecture?
- A. A DHCP server must be enabled on the border nodes to allow subnets to span multiple fabric edges.
- B. DHCP-relay must be enabled on fabric edge nodes to provide the correct mapping of DHCP scope to the local anycast gateway.
- C. DHCP Option-82 must be enabled to map the circuit IP option to the access fabric node where the DHCP discover originated.
- D. DHCP servers must support Cisco SD-Access extensions to correctly assign IPs to endpoints in an SD-Access fabric with anycast gateway.
Answer: C
Explanation:
https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/tech_notes/sda_dhcp/b_cisco_sda_dhcp.html
NEW QUESTION 56
Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?
- A. NSSA
- B. stub
- C. totally stubby
- D. normal
Answer: C
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION 57
A customer's environment includes hosts that support IPv6-only. Several of these hosts must communicate with a public web server that has only IPv4 domain name resolution. Which solution should the customer use in this environment?
- A. Implement NAT44 at the edge of the customer network
- B. implement 6PE to resolve hostname resolution
- C. utilize NAT64 to translate the addresses
- D. use 6to4 and a tunnel to translate the addresses
Answer: C
NEW QUESTION 58
Refer to the exhibit. AS65533 and AS65530 are announcing a partial Internet routing table as well as their IP subnets. An architect must create a design that ensures AS64512 become a transit AS. Which filtering solution must the architect choose?
- A. Next-hop
- B. Maximum-prefix
- C. No-advertise
Answer: B
NEW QUESTION 59
Which method will filter routes between EIGRP neighbors within the same autonomous system?
- A. policy-based routing
- B. distribute-list
- C. leak-map
- D. route tagging
Answer: B
NEW QUESTION 60
A customer has several remote sites connected with their headquarters through microwave links. An engineer must propose a backup WAN solution based on these conditions:
Which backup WAN link type the engineer recommend?
- A. LTE
- B. 802.15.1 Bluetooth
- C. 802.16 WiMAX
- D. Laser link
Answer: A
NEW QUESTION 61
See the solution below
Explanation/Reference:
There are two ways to configure interVLAN routing in this case:
+ Use RouterC as a "router on a stick" and SwitchC as a pure Layer2 switch. Trunking must be established between RouterC and SwitchC.
+ Only use SwitchC for interVLAN routing without using RouterC, SwitchC should be configured as a Layer 3 switch (which supports ip routing function as a router). No trunking requires.
The question clearly states "No trunking has been configured on RouterC" so RouterC does not contribute to interVLAN routing of hosts H1 & H2 -> SwitchC must be configured as a Layer 3 switch with SVIs for interVLAN routing.
We should check the default gateways on H1 & H2. Click on H1 and H2 and type the "ipconfig" command to get their default gateways.
Answer:
Explanation:
\>ipconfig
We will get the default gateways as follows:
Host1:
+ Default gateway: 190.200.250.33
Host2:
+ Default gateway: 190.200.250.65
Now we have enough information to configure SwitchC (notice the EIGRP AS in this case is 650) Note: VLAN2 and VLAN3 were created and gi0/10, gi0/11 interfaces were configured as access ports so we don't need to configure them in this sim.
SwitchC# configure terminal
SwitchC(config)# int gi0/1
SwitchC(config-if)#no switchport -> without using this command, the simulator does not let you assign IP address on Gi0/1 interface.
SwitchC(config-if)# ip address 10.10.10.2 255.255.255.0 ->RouterC has used IP 10.10.10.1 so this is the lowest usable IP address.
SwitchC(config-if)# no shutdown
SwitchC(config-if)# exit
SwitchC(config)# int vlan 2
SwitchC(config-if)# ip address 190.200.250.33 255.255.255.224
SwitchC(config-if)# no shutdown
SwitchC(config-if)# int vlan 3
SwitchC(config-if)# ip address 190.200.250.65 255.255.255.224
SwitchC(config-if)# no shutdown
SwitchC(config-if)#exit
SwitchC(config)# ip routing (Notice: MLS will not work without this command) SwitchC(config)# router eigrp 65010 SwitchC(config-router)# network 10.10.10.0 0.0.0.255 SwitchC(config-router)# network 190.200.250.32 0.0.0.31 SwitchC(config-router)# network 190.200.250.64 0.0.0.31 NOTE: THE ROUTER IS CORRECTLY CONFIGURED, so you will not miss within it in the exam, also don't modify/delete any port just do the above configuration. Also some reports said the "no auto-summary" command can't be used in the simulator, in fact it is not necessary because the network 190.200.0.0/16 is not used anywhere else in this topology.
In order to complete the lab, you should expect the ping to SERVER to succeed from the MLS, and from the PCs as well.
Also make sure you use the correct EIGRP AS number (in the configuration above it is 650 but it will change when you take the exam) but we are not allowed to access RouterC so the only way to find out the EIGRP AS is to look at the exhibit above. If you use wrong AS number, no neighbor relationship is formed between RouterC and SwitchC.
In fact, we are pretty sure instead of using two commands "network 190.200.250.32 0.0.0.31″ and "network
190.200.250.64 0.0.0.31″ we can use one simple command "network 190.200.0.0″ because it is the nature of distance vector routing protocol like EIGRP: only major networks need to be advertised; even without "no auto- summary" command the network still works correctly. But in the exam the sim is just a flash based simulator so we should use two above commands, just for sure. But after finishing the configuration, we can use "show run" command to verify, only the summarized network 190.200.0.0 is shown.
NEW QUESTION 62
......
Network Services
The questions from this subject area cover 20% of the entire content and evaluate the candidates’ ability to perform the following operations:
- Explain the concepts of multicast routing (rendezvous points, source trees, shared trees, and RPF);
- Design the policies for end-to-end QoS, including queuing, shaping, policing, marking & classification;
- Design the techniques for network management, such as prioritize network management traffic, in-band versus out-of-band, and segmented management networks;
- Choose the relevant QoS strategies to meet the requirements of customers;
- Design SSM, MSDP, and PIM bi-directional multicast services.
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