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Understanding of functional and technical aspects of Troubleshooting basic performance issues

The following will be discussed in this section:

• Differentiate between performance issue types (i.e. Latency, Congestion, broken content)
• Establish the frequency of a given issue (random, continuous, isolated, intermittent, repetitive intervals)
• Use BIG-IP tools in order to identify potential performance issues
• Understand how to get performance statistics in addition to the those shown in the dashboard (Overview - Performance)
• Recognize when a packet capture is needed within the context of a performance issue

NEW QUESTION 79
A virtual server is defined using a source address based persistence profile. The last five connections were A, B, C, A, C . Given the conditions shown in the graphic, if a client with IP address 205.12.45.52 opens a connection to the virtual server, which member will be used for the connection?

• A. 10.10.20.4:80
• B. 10.10.20.3:80
• C. 10.10.20.5:80
• D. 10.10.20.1:80
• E. 10.10.20.2:80

Answer: E

 

NEW QUESTION 80
A standard virtual server is defined with a pool and a SNAT using automap. All other settings for the virtual server are at defaults. When client traffic is processed by the BIGElIP, what will occur to the IP addresses.

• A. Traffic initiated to the virtual server will have the destination address translated to a pool member address and the source addressTraffic initiated to the virtual server will have the destination address translated to a pool member. address and the source address translated to a selfElIP address.
• B. Traffic initiated to the virtual server will have the destination address translated to a pool member address and the source addressTraffic initiated to the virtual server will have the destination address translated to a pool member. address and the source address translated to a selfElIP address. Traffic arriving destined to other destinations will have the source translated to a selfElIP address only.
• C. Traffic
  initiated by selected clients, based
  on their IP address, will have the source address translated to a selfElIP address but the destination will only be translated if the traffic is destined to the virtual server.
• D. Traffic initiated by the pool members will have the source address translated to a selfElIP address but the destination address will not be changed.

Answer: A

 

NEW QUESTION 81
A BIG-IP device has only LTM and ASM modules provisioned. Both have nominal provisioning level. The BI6-IP Administrator wants to dedicate more resources to the LTM module. The ASM module must remain enabled. Which tmsh command should the BIG-IP Administrator execute to obtain the desired result?

• A. modify /sys provision asm level none
• B. modify /sys provision Itm level dedicated
• C. modify /sys provision Itm level minimum
• D. modify/sys provision asm level minimum

Answer: D

 

NEW QUESTION 82
Which statement
is true concerning the default
communication between a redundant pair of BIGElIP devices.

• A. Communication between the systems cannot be effected by
  port lockdown settings.
• B. Regardless of the configuration,
  some data is communicated between the systems at regular intervals.
• C. Connection mirroring data is shared through the serial faEl ilover cable unless network failover is enabled.
• D. Data for both connection and persistence mirroring are shared through the same TCP connection.

Answer: D

 

NEW QUESTION 83
Refer to the exhibit.

Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile.
Which persistence profile type should the BIG-IP Administrator use for this purpose?

• A. Source Address Affinity
• B. Hash
• C. Universal
• D. SSL

Answer: A

 

NEW QUESTION 84
Refer to the exhibit

A connection is being established to IP 1.1.1.1 on port 8080.
Which virtual server will handle the connection?

• A. fwd_8080_vs
• B. host_ 8080_VS
• C. host_vs
• D. fwdvs

Answer: C

 

NEW QUESTION 85
What is the purpose of MAC masquerading.

• A. to minimize connection loss due to ARP cache refresh delays
• B. to prevent ARP cache errors
• C. to allow both BIGElIP devices to simultaneously use the same MAC address
• D. to minimize ARP entries on routers

Answer: A

 

NEW QUESTION 86
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 Trunk listing the allowed VLAN IDs and MAC addresses configured on the switches.
• C. A virtual server with an LACP profile and the interfaces connected to the switches as pool members.
• D. A Trunk containing an interface connected to each switch.

Answer: D

 

NEW QUESTION 87
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 TCP monitor with a custom interval/timeout
• B. A UDP monitor with a custom interval/timeout
• C. A combination of ICMP + TCP monitor
• 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 88
Refer to the exhibit.

A BIG-IP Administrator configures a Virtual Server to handle HTTPS traffic. Users report that the application is NOT working.
Which actional configuration is regard to resolve this issue?

• A. Configure SSL Profile (Client)
• B. Configure Service Profile HTTP
• C. Configure Protocol Profile (Server)
• D. Configure SSL Profile (Server)

Answer: A

 

NEW QUESTION 89
Which event is always triggered when a client initially connects to a virtual server configured with an HTTP profile.

• A. HTTP_REQUEST
• B. HTTP_DATA
• C. CLIENT_DATA
• D. CLIENT_ACCEPTED

Answer: D

 

NEW QUESTION 90
Assuming there are open connections through an active system's NAT and aEl fo av ielr occurs, by default, what happens to those connections.

• A. LongEllived connections such as Telnet and FTP will be maintained while shortEllived connectio ns such as HTTP will be lost.
• B. All open connections will be lost.
• C. All open connections are lost, but new connections are initiated by the newly actiEl vI eP, BIG resulting in minimal client downtime.
• D. All open connections will be maintained.
• E. The "Mirror" option must be chosen on the NAT and the setting synchronized prior to the connection establishment.

Answer: D

 

NEW QUESTION 91
A BIG-IP Administrator need to ensure that a pool member and down by the monitor the BIG-IP system sends existing connections to another be pool member.
Which should the BIG-IP Administrator perform to meet this goal?

• A. Enable mirroring within the persistence profile.
• B. Set Action Service Down setting under the pool configuration to reselect.
• C. Set Action on Service Down sing under the server configuration to reselect.
• D. Reconfigure the pool motor members as UP.

Answer: B

 

NEW QUESTION 92
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 Rewrite Profile has NOT been configured.
• B. The Connection Limit is set too low.
• C. The Connection Rate Limit is set too high
• D. The server SSL Profile has NOT been reconfigured.

Answer: B

Explanation:
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 93
A BIG-IP Administrator needs to find which modules have been licensed for use on the BIG-IP system. In which section of the Configuration Utility can the BIG-IP Administrator find this information?

• A. System > Services
• B. System > Support
• C. System > Platform
• D. System > Resource Provisioning

Answer: D

 

NEW QUESTION 94
How should a BIG-IP Administrator control the amount of traffic that a newly enabled pool member receives.

• A. set the Priority Group Activation
• B. set a Connection Limit
• C. set the Slow Ramp Time
• D. set a Health Monitor

Answer: C

Explanation:
Explanation
Slow Ramp Time
Specifies the duration during which the system sends less traffic to a newly-enabled pool member. The amount of traffic is based on the ratio of how long the pool member has been available compared to the slow ramp time, in seconds. Once the pool member has been online for a time greater than the slow ramp time, the pool member receives a full proportion of the incoming traffic. Slow ramp time is particularly useful for the least connections load balancing mode.
Setting this to a nonzero value can cause unexpected Priority Group behavior, such as load balancing to a low-priority member even with enough high-priority servers.

 

NEW QUESTION 95
Which method is recommended for creating a new user from the CLI?

• A. Run tmsh create auth user username prompt for password' from bash
• B. Run useradd username' then 'passwd username' from bash tmsh
• 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: A

 

NEW QUESTION 96
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