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Understanding of functional and technical aspects of Troubleshooting Basic Virtual Server Connectivity Issues
The following will be discussed in this section:
- Verify the pool member/node Ratio configuration
- Verify the pool member/node connection configuration and count
- Explain the concept of âpersistenceâ
- Determine the state and availability of the pool member/node in question
- Determine if a virtual server is configured for the proper listening port
- Determine if the virtual server is configured with the appropriate profiles
- Understand how a virtual server processes a request (most specific to least specific)
- Verify the type of persistence profile assigned to the virtual server in question
- Determine the state of a virtual server (offline, enabled, etc.)
- Validate the expected persistence behavior
- Given a specific connectivity issue, isolate where the problem might be according to the processing order
- Determine if the pool configuration has an effect on virtual server state
- Understand the effects of health monitors on the status of pool members/nodes
- Determine which tools to use in order to diagnose the issue
- Understand how a packet is processed once it arrives at device (connection table, packet filters, etc.)
- Understand the difference between the virtual servers status definitions
- Determine if a virtual server is configured with the proper IP address configuration
- Differentiate between fallback and primary persistence
- Use the appropriate tool to troubleshoot persistence
NEW QUESTION 119
What is the purpose of floating selfElIP addresses?
- A. to define an address that grants administrative access to either system at any time
- B. to define an address that allows network devices to route traffic via a single IP address
- C. to define an address that gives network devices greater flexibility in choosing a path to forward traffic
- D. to define an address that allows either system to initiate communication at any time
Answer: B
NEW QUESTION 120
Refer to the exhibit.
The BIG-IP Administrator has modified an iRule on one device of an HA pair. The BIG-IP Administrator notices there is NO traffic on the BIG-IP device in which they are logged into.
What should the BIG-IP Administrator do to verify if the iRule works correctly?
- A. Push configuration from this device to the group and start to monitor traffic on this device
- B. Log in to the other device in the cluster, push configuration from it, and start to monitor traffic on that device
- C. Pull configuration to this device to the cluster and start to monitor traffic on this device
- D. Log in to the other device in the cluster, pull configuration to it, and start to monitor traffic on that device
Answer: D
Explanation:
The device in the picture is a standby machine, of course there is no traffic, you need to log in to the host, and then pull the configuration to the host.
NEW QUESTION 121
A BIG-IP Administrator needs to have a BIG-IP linked to two upstream switches for resilience of the external network. The network engineer who is going to configure the switch instructs the BIG-IP Administrator to configure interface binding with LACP. Which configuration should the administrator use?
- A. A virtual server with an LACP profile and the switches' management IPs as pool members.
- B. A virtual server with an LACP profile and the interfaces connected to the switches as pool members.
- C. A Trunk containing an interface connected to each switch.
- D. A Trunk listing the allowed VLAN IDs and MAC addresses configured on the switches.
Answer: C
NEW QUESTION 122
A BIG-IP Administrator is configuring a pool with members who have differing capabilities. Connections to pool members must be load balanced appropriately.
Which load balancing method should the BIG-IP Administrator use?
- A. Fastest (node)
- B. Least Sessions
- C. Weighted Least Connections (member)
- D. Least Connections (member)
Answer: C
NEW QUESTION 123
Which statement is true regarding failElover.
- A. By default, hardware faElilover detects voltage across the failElover cable and monitors traffic across the internal VLAN.
- B. Hardware failElover can be used in conjunction with network failover.
- C. Hardware failElover is disabled by default.
- D. If the hardware failElover cable is disconnected, both BIGElIP devices will always assume the active role.
Answer: B
NEW QUESTION 124
A BIGJP Administrator needs to load a UCS file but must exclude the license file. How should the administrator perform this task?
- A. From the GUI, select the UCS file and click restore
- B. From the CLI with command(tmos) tmsh load /sys ucs <ucs filename> no-license
- C. From the CLI with command U tmsh load /$ys ucs <ucs filename> no-license
- D. From the GUI, select the UCS file, unchcck the license box, and click restore
Answer: C
NEW QUESTION 125
Which method is recommended for creating a new user from the CLI?
- A. Run useradd username' then 'passwd username' from bash tmsh
- B. Run tmsh create auth user username prompt for password' from bash
- C. Run f5adduser username' then 'f5passwd username' from bash or tmsh
- D. edit bigip.conf to add the new user and the user's clear-text password
Answer: B
Explanation:
Reference:
The f5adduser commands were removed and tmsh is the recommended way to create users.
https://support.f5.com/csp/article/K11677
NEW QUESTION 126
Which event is always triggered when a client initially connects to a virtual server configured with an HTTP profile.
- A. HTTP_REQUEST
- B. CLIENT_ACCEPTED
- C. HTTP_DATA
- D. CLIENT_DATA
Answer: B
NEW QUESTION 127
A pool of four servers has been partially upgraded for two new servers with more memory and CPU capacity.
The BIG-IP Administrator must change the load balance method to consider more connections for the two new servers. Which load balancing method considers pool member CPU and memory load?
- A. Ratio
- B. Least Connection
- C. Dynamic Ratio
- D. Round Robin
Answer: A
NEW QUESTION 128
A BIG-IP Administrator needs to collect HTTP status code and HTTP method for traffic flowing through a virtual server.
Which default profile provides this information?
- A. Analytics
- B. Statistics
- C. Request Adapt
- D. HTTP
Answer: D
NEW QUESTION 129
Refer to the exhibit.
A user notifies the BIG-IP Administrator that http://remote company.com is NOT accessible. Remote access to company resources must be encrypted.
What should the BIG-IP Administrator do to fix the issue?
- A. Change the Type of the Virtual Server remote.company.com_vs to Forwarding Requiring all traffic to be HTTPS access requires HTTP requests to be redirected directly to HTTPS.
- B. Change the Listening Port on remote.company.com_vs to Port 80
- C. Add an iRule to remote.company.com_vs to redirect Traffic to HTTPS
- D. Add a Pool to the Virtual Server remote.company.com_VS
Answer: C
NEW QUESTION 130
A node is a member of various pools and hosts different web applications. If a web application is unavailable, the BIG-IP appliance needs to mark the pool member down for that application pool. What should a BIG-IP Administrator deploy at the pool level to accomplish this?
- A. A combination of ICMP + TCP monitor
- B. A TCP monitor with a custom interval/timeout
- C. A UDP monitor with a custom interval/timeout
- D. An HTTP monitor with custom send/receive strings
Answer: D
Explanation:
Explanation
Requiring all traffic to be HTTPS access requires HTTP requests to be redirected directly to HTTPS.
NEW QUESTION 131
A BIG-IP Administrator needs to determine which pool members in a pool have been manually forced offline and are NOT accepting any new traffic. Which status icon indicates this?
A)
B)
C)
D)
- A. Option
- B. Option
- C. Option
- D. Option
Answer: B
NEW QUESTION 132
Assuming other failElover settings are at their default state, what would occur if the failElover cable were to be disconnected for five seconds and then reconnected.
- A. When the cable is disconnected, both systems will become active. When the voltage is restored, both systems will maintain active mode.
- B. When the cable is disconnected, both systems will become active. When the voltage is restored, unit two will revert to standby mode.
- C. Nothing. FailElover due to loss of voltage will not occur if the voltage is lost for less than ten seconds.
- D. As long as network communication is not lost, no change will occur.
Answer: B
NEW QUESTION 133
A BIG-IP Administrator adds new Pool Members into an existing, highly utilized pool. Soon after, there are reports that the application is failing to load for some users. What pool level setting should the BIG-IP Administrator check?
- A. Slow Ramp Time
- B. Allow SNAT
- C. Availability Requirement
- D. Action On Service Down
Answer: A
Explanation:
Explanation
Option ABC is a global configuration, has nothing to do with the new pool member, select D after excluding
NEW QUESTION 134
A site would like to ensure that a given web server's default page is being served correctly prior to sending it client traffic. They assigned the default HTTP monitor to the pool. What would the member status be if it sent an unexpected response to the GET request.?
- A. The pool member would be marked online (green).
- B. The pool member would alternate between red and green.
- C. The pool member would be marked unknown (blue).
- D. The pool member would be marked offline (red).
Answer: A
NEW QUESTION 135
Which statement is true about the synchronization process, as performed by the Configuration Utility or by typing b config sync all.
- A. The process should always be run from the system with the latest configuration.
- B. The process should always be run from the standby system.
- C. Multiple files,
including
/config/bigip.conf and
/config/bigip_base.conf,
are synchronized (made identical) each time the process is run. - D. The two /config/bigip.conf configuration files are synchronized (made identical) each time the process is run.
Answer: D
NEW QUESTION 136
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system. Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
- A. The Connection Limit is set too low.
- B. The Connection Rate Limit is set too high
- C. The Rewrite Profile has NOT been configured.
- D. The server SSL Profile has NOT been reconfigured.
Answer: A
Explanation:
The topic explains that the connection reset behavior is caused by the vs configuration rather than the server resource problem. The answers B C are all configuration at the service forwarding level. If there is a problem with the configuration, it is all a problem rather than some users. Answer C's Connection Limit will cause a reset behavior when the connection reaches the threshold.
NEW QUESTION 137
A BIG-IP Administrator notices that one of the servers that runs an application is NOT receiving any traffic. The BIG-IP Administrator examines the configuration status of the application and observes the displayed monitor configuration and affected Pool Member status. What is the possible cause of this issue?
- A. The Node Health Monitor is NOT responding.
- B. The application is NOT responding with the expected Receive String.
- C. HTTP 1.1 is NOT appropriate for monitoring purposes.
- D. The BIG-IP device is NOT able to reach the Pool.
Answer: A
NEW QUESTION 138
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