Exam 200-301 topic 1 question 560 discussion

i hate that question

Correct Answer therefore : B. SW1# config t SW1(config)#ntp master SW1(config)#ntp server192.168.1.1

B is correct

NTP server, so is NTP master

B is correct, and the NTP clients should also be instructed to prefer the upstream server with "ntp server <address> prefer".

In NTP Configuration, to set a Cisco device as NTP Server, we use “ntp master stratum-level” command on it. Here, we will use Stratum Level 1. https://ipcisco.com/lesson/cisco-ntp-configuration/

The correct explanation would be: SW(config)# ntp server 192.168.1.1 Makes the SW1 a client to the primary server reachable with an IP address of 192.168.1.1 SW1(config)# ntp master Makes SW1 a server and uses its own internal clock to provide the time when the connectivity to the primary server 192.168.1.1 fails. - The key is the following statement "SW1 act as an NTP server". - It implies issue an "ntp master" configuration command obligatory. - So, answer is B

Option B, SW1# config t SW1(config)#ntp master SW1(config)#ntp server 192.168.1.1, is not the correct answer because it configures the switch to be the primary NTP server. This means that the switch will be responsible for synchronizing the time of all other devices in the network. In the case of the question, the switch is configured to act as a backup NTP server. This means that the switch will only provide NTP services if the upstream NTP server becomes unavailable. If the switch is configured as the primary NTP server, it will not be able to act as a backup NTP server. This is because the switch will be too busy synchronizing the time of all other devices in the network. Therefore, the correct configuration is to use the ntp backup and ntp server commands. These commands will configure the switch to act as a backup NTP server, and they will also specify the IP address of the upstream NTP server. If the upstream NTP server becomes unavailable, the switch will start providing NTP services to the network using its own internal clock.

Correct me if I'm wrong but I think it's B because: The "NTP Master" command sets this device (SW1) as an NTP server, the second command "NTP server 192.168.1.1" synchronises this device to 192.168.1.1's time. if the upstream connectivity to 192.168.1.1 is lost, this device will continue to act as a NTP server for the rest of the hosts in the network.

answer is B

It's worth noting that A and C aren't even valid commands for NTP in IOS. so you can at least rule those bad boi's out.

Answer B

ntp server192.168.1.1 makes the SW1 a client to the primary server reachable with an ip add 192.168.1.1 NTP server makes SW1 a server and uses its own internal clock to provide the time when the connectivity to the primary server 192.168.1.1 fails.

"all upstream NTP server connectivity fails." On SW1 (not yet an NTP server), 1. Where is the access-list? 2. How does this client obtain it? 3. Do switches typically utilize ACLs? - As a novice, I'd pick B

ntp master = Configures the device as an authoritative NTP server. (this is for when you are doodling with the configuration on the switch after the thing fails) https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_2/nx-os/system_management/configuration/guide/sm_nx_os_cli/sm_3ntp.pdf?bcsi-ac-4d57fec82d0c41f9=271918E500000005olcsuBTZcAIAy9u9O1OlNPqAoEAbAQAABQAAAIKYCAGAcAAAAAAAAK0iAgA= B

You can create NTP peer relationships to designate the time-serving hosts that you want your network device to consider synchronizing with and to keep accurate time if a server failure occurs. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/system-management/guide/b_Cisco_Nexus_7000_Series_NX-OS_System_Management_Configuration_Guide-RI/configuring_ntp.html

The answer is A base on the link posted by oflu61. Here is the relevant passage to make life easier: "A peer that is configured alone takes on the role of a server and should be used as a backup. If you have two servers, you can configure several devices to point to one server and the remaining devices to point to the other server. You can then configure a peer association between these two servers to create a more reliable NTP configuration."