Cisco 350-401 Online Practice Questions and Exam Preparation

Cisco 350-401 Online Questions & Answers

• Question 31:

  Which First Hop Redundancy Protocol maximizes uplink utilization and minimizes the amount of configuration that is necessary?

  A. GLBP
  B. HSRP v2
  C. VRRP
  D. HSRP v1
  A. GLBP

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  Explanation

  only GLBP can maximize utilzation of links by being ACTIVE/ACTIVE while all others are ACTIVE/STANDBY/LISTENING

  NOTE!!!! there is NO MHSRP only HSRP v1 and 2.

• Question 32:

  What is a characteristic of a type 2 hypervisor?

  A. ideal for data center
  B. complicated deployment
  C. ideal for client/end-user system
  D. referred to as bare-metal
  C. ideal for client/end-user system

• Question 33:

  DRAG DROP

  Drag and drop the code snippets from the bottom onto the blanks in the Python script to print the device model to the screen and write JSON data to a file. Not all options are used.

  Select and Place:

  

  

• Question 34:

  Which QoS mechanism will prevent a decrease in TCP performance?

  A. Shaper
  B. Rate-Limit
  C. Policer
  D. Fair-Queue
  E. WRED
  F. LLQ
  E. WRED

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  Explanation

  Weighted Random Early Detection (WRED) is just a congestion avoidance mechanism. WRED drops packets selectively based on IP precedence. Edge routers assign IP precedences to packets as they enter the network. When a packet arrives, the following events occur: The average queue size is calculated.

  2. If the average is less than the minimum queue threshold, the arriving packet is queued.

  3. If the average is between the minimum queue threshold for that type of traffic and the maximum threshold for the interface, the packet is either dropped or queued, depending on the packet drop probability for that type of traffic.

  4. If the average queue size is greater than the maximum threshold, the packet is dropped. WRED reduces the chances of tail drop (when the queue is full, the packet is dropped) by selectively dropping packets when the output interface begins to show signs of congestion (thus it can mitigate congestion by preventing the queue from filling up). By dropping some packets early rather than waiting until the queue is full, WRED avoids dropping large numbers of packets at once and minimizes the chances of global synchronization. Thus, WRED allows the transmission line to be used fully at all times. WRED generally drops packets selectively based on IP precedence. Packets with a higher IP precedence are less likely to be dropped than packets with a lower precedence. Thus, the higher the priority of a packet, the higher the probability that the packet will be delivered.

  References:

  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/15-mt/qos-conavd-15-mt-book/qos-conavd-cfg-wred.html

  WRED is only useful when the bulk of the traffic is TCP/IP traffic. With TCP, dropped packets indicate congestion, so the packet source will reduce its transmission rate. With other protocols, packet sources may not respond or may resend dropped packets at the same rate. Thus, dropping packets does not decrease congestion. Reference: (https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/xe-16/qos-conavd-xe-16-book/qos-conavd-oview.htmlNote:)

  Global synchronization occurs when multiple TCP hosts reduce their transmission rates in response to congestion. But when congestion is reduced, TCP hosts try to increase their transmission rates again simultaneously (known as slow-start algorithm), which causes another congestion. Global synchronization produces this graph:

• Question 35:

  What is a benefit of a virtual machine when compared with a physical server?

  A. Multiple virtual servers can be deployed on the same physical server without having to buy additional hardware.
  B. Virtual machines increase server processing performance.
  C. The CPU and RAM resources on a virtual machine cannot be affected by other virtual machines.
  D. Deploying a virtual machine is technically less complex than deploying a physical server.
  A. Multiple virtual servers can be deployed on the same physical server without having to buy additional hardware.

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  Explanation

  Definitely not C, because CPU resources are shared in all well known hypervisors, RAM may be shared or not (depends on hypervisor)

• Question 36:

  Refer to the exhibit.

  

  Which configuration must be added to R2 to enable PC3 to obtain a DHCP address and successfully ping PC1?

  A. Router(config)# vrf definition PRODUCTION Router(config-vrf)# address-family ipv4 Router(config)# interface GigabitEthernet 0/0 Router(config-if)# vrf forwarding PRODUCTION Router(config-if)# ip address 10.199.0.1 255.255.252.0 Router(config)# ip dhcp pool R&D Router(dhcp-config)# vrf PRODUCTION
  B. Router(config)# vrf definition PRODUCTION Router(config-vrf)# rd 1:100 - Router(config)# router eigrp 100 Router(config-rtr)# redistribute vrf PRODUCTION
  C. Router(config)# vrf definition PRODUCTION Router(config-vrf)# vnet tag 100 Router(config)# interface GigabitEthernet 0/0 Router(config-if)# vnet trunk -
  D. Router(config)# vrf definition PRODUCTION Router(config-vrf)# rd 1:100 - Router(config-vrf)# address-family ipv4 Router(config)# router eigrp 100 Router(config-rtr)# route-target export 1:100
  A. Router(config)# vrf definition PRODUCTION Router(config-vrf)# address-family ipv4 Router(config)# interface GigabitEthernet 0/0 Router(config-if)# vrf forwarding PRODUCTION Router(config-if)# ip address 10.199.0.1 255.255.252.0 Router(config)# ip dhcp pool R&D Router(dhcp-config)# vrf PRODUCTION

• Question 37:

  A network engineer is configuring OSPF on a router. The engineer wants to prevent having a route to 177.16.0.0/16 learned via OSPF. In the routing table and configures a prefix list using the command ip prefix-list OFFICE seq S deny

  172.16.0.0/16.

  Which two identical configuration commands must be applied to accomplish the goal? (Choose two.)

  A. distribute-list prefix OFFICE in under the OSPF process
  B. Ip prefix-list OFFICE seq 10 permit 0.0.0.0/0 Ie 32
  C. ip prefix-list OFFICE seq 10 permit 0.0.0.0/0 ge 32
  D. distribute-list OFFICE out under the OSPF process
  E. distribute-list OFFICE in under the OSPF process
  A. distribute-list prefix OFFICE in under the OSPF process
  B. Ip prefix-list OFFICE seq 10 permit 0.0.0.0/0 Ie 32

• Question 38:

  What is a benefit of YANG modules?

  A. tightly coupled models with encoding to improve performance
  B. easier multivendor interoperability provided by common or industry models
  C. avoidance of ecosystem fragmentation by having fixed that cannot be changed
  D. single protocol and model couple to simplify maintenance and supported
  B. easier multivendor interoperability provided by common or industry models

• Question 39:

  Which two actions are recommended as security best practices to protect REST API? (Choose two.)

  A. Use SSL for encryption.
  B. Enable out-of-band authentication.
  C. Enable dual authentication of the session.
  D. Use TACACS+ authentication.
  E. Use a password hash.
  A. Use SSL for encryption.
  C. Enable dual authentication of the session.

• Question 40:

  An engineer is configuring GigabitEthernet1/0/0 for VRRP. When the router has the highest priority in group 5, it must assume the master role.

  Which command set should the engineer add to the configuration to accomplish this task?

  interface GigabitEthernet1/0/0

  description To IDF A 38-70-774-10

  ip address 172.16.13.2 255.255.255.0

  A. standby 5 ip 172.16.13.254 standby 5 priority 100 standby 5 track 1 decrement 10
  B. standby 5 ip 172.16.13.254 standby 5 priority 100 standby 5 preempt
  C. vrrp 5 ip 172.16.13.254 vrrp 5 priority 100
  D. vrrp 5 ip 172.16.13.254 255.255.255.0 vrrp 5 track 1 decrement 10 vrrp 5 preempt
  C. vrrp 5 ip 172.16.13.254 vrrp 5 priority 100

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  Explanation

  Preempt is by default enabled on VRRP.