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AN LTM Specialist receives reports that an external company application is having reliability issues. The F5 Administrator finds the following in /vat/log/ltm file.
The LTM Specialist determines that the F5 LTMdevice is entering into Aggressive Mode Adaptive Reaping, which is causing the site reliability issues.
What is the most likely reason that the LTM device has entered into Aggressive Mode Adaptive Reaping?
There are three servers in the pool: 172.16.20.1, 172.16.20.2, and 172.16.20.3, with the virtual IP address 10.0.20.88.
A user CANNOT connect to an HTTP application. To understand the problem and find a solution, the LTM Specialist runs two concurrent traces on the LTM device, with the following results:
Trace on client side:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 96 bytes
22:22:07.423759 IP 172.16.20.100.53875 > 10.0.20.88.80: S 998346084:998346084(0) win 5840
22:22:07.424056 IP 10.0.20.88.80 > 172.16.20.100.53875: S 4671780:4671780(0) ack 998346085 win 4380
22:22:07.424776 IP 172.16.20.100.53875 > 10.0.20.88.80: . ack 1 win 365
22:22:07.424790 IP 172.16.20.100.53875 > 10.0.20.88.80: P 1:149(148) ack 1 win 365
22:22:07.424891 IP 10.0.20.88.80 > 172.16.20.100.53875: . ack 149 win 4528
22:22:12.024850 IP 10.0.20.88.80 > 172.16.20.100.53875: R 1:1(0) ack 149 win 4528
6 packets captured
6 packets received by filter
0 packets dropped by kernel
Trace on server side:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on internal, link-type EN10MB (Ethernet), capture size 96 bytes
22:22:07.424881 IP 172.16.20.100.53875 > 172.16.20.2.80: S 51116678:51116678(0) win 4380
22:22:08.424893 IP 172.16.20.100.53875 > 172.16.20.2.80: S 51116678:51116678(0) win 4380
22:22:09.625082 IP 172.16.20.100.53875 > 172.16.20.2.80: S 51116678:51116678(0) win 4380
22:22:10.825194 IP 172.16.20.100.53875 > 172.16.20.2.80: S 51116678:51116678(0) win 4380
4 packets captured
4 packets received by filter
0 packets dropped by kernel
What should the LTM Specialist do to solve the problem?
An SSL application is being migrated to the LTM device. Both encrypted and unencrypted traffic are accepted by the server. The virtual server configuration is as follows:
Which LTM device profile should be used on the LTM device to reduce the CPU load on the current.
A BIG-IP Administrator needs to restore an encrypted UCS archive from the command line using the
TMSH utility.
Which TMSH command should the BIG-IP Administrator use to accomplish this?
One of the two members of a device group has been decommissioned. The BIG-IP Administrator tries to
delete the device group, but is unsuccessful.
Prior to removing the device group, which action should be performed?
Refer to the exhibit.
A BIG-IP Administrator creates a new Virtual Server. The end user is unable to access the page. During
troubleshooting, the administrator learns that the connection between the BIG-IP system and server is
NOT set up correctly.
What should the administrator do to solve this issue?
-- Exhibit –
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Refer to the exhibit.
An LTM Specialist is troubleshooting a new HTTP monitor on a pool. The pool member is functioning correctly when accessed directly through a browser, although the monitor is marking the member as down. As part of the troubleshooting, the LTM Specialist has captured the monitor traffic via tcpdump.
How should the LTM Specialist resolve this issue?
An LTMSpecialist must reconfigure a BIG-IP LTM system that load balances traffic to web application servers. The application developer inform the LTM Specialist that TLS must be used to communicate
with the application servers.
Which additional profile isrequired as part of virtual server configuration?
Refer to the exhibit.
An LTM device has a virtual server mapped to www.f5.com. Users report that when they connect to
/resources/201.1.2h.l_l.com they are unable to receive content.
What is the likely cause of the issue?
A BIG-IP Administrator reviews the log files to determine the cause of a recent problem and finds the
following entry.
Mar 27.07.58.48 local/BIG-IP notice mcpd {5140} 010707275 Pool member 172.16.20.1.10029 monitor
status down.
What is the cause of this log message?
A BIG-IP Administrator plans to upgrade a BIG-IP device to the latest TMOS version.
Which two tools could the administrator leverage to verify known issues for the target versions?
(Choose two.)
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
An LTM Specialist has created a virtual server to load balance traffic to a pool of HTTPS servers. The servers use client certificates for user authentication. The virtual server has clientssl, serverssl, and http profiles enabled. Clients are unable to connect to the application through the virtual server. Clients are able to connect to the application servers directly.
What is the root cause of the problem?
An organization’s development team creates an application to put behind the F5LTM device. The application can be quite load intensive at first, and then evens out over time. The team’s load balancing method needs to select a pool after taking into account the pool member’s response over the time to avoid landing on a busy pool member.
Which of the following load balancing methods meets this requirement?
A BIG-IP Administrator finds the following log entry:
tnm tmm[7141]: 011e0002:4: sweeperjjpdate: aggressive mode activated.
Which action should the BIG-IP Administrator to mitigate this memory issue?
Refer to the Exhibit.
An LTM Specialist notices that two members in a pool are overloaded. To relive the existing members a fourth member (10.128.20.14) is brought up.
How many member will receive and process new connections?
The BIG-IP Administrator needs to ensure the correct health monitor is being used lor a new HTTP pool
named P_example.
Where should the BIG-IP Administrator validate these settings in the Configuration Utility?
An LTM device is load balancing SIP traffic. An LTM Specialist notices that sometimes the SIP request is being load balanced to the same server as the initial connection.
Which setting in the UDP profile will make the LTM device more evenly distribute the SIP traffic?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
An LTM Specialist is investigating reports that users are unable to perform some commands through an FTP virtual server. The users are receiving the FTP error "500 Illegal PORT command." The virtual server is configured to SNAT using automap. The LTM Specialist performs a capture on the server side of the LTM device.
Why is the server returning this error?
An LTM device an application that requires all connections to be secured via SSL The device must verify that request contain a specific cookie before allowing the request to be sent to the pool member.
Which virtual server type should an LTM Specialist configure on the LTM device?
A Client makes the request displayed below to the application server.
Which virtual server type should an LTM Specialist use to load balance based on the URI?
.A. Forwarding (Layer 2)
B. Stateless
C.Standard
D. Performance (Layer 4)
Refer to the exhibit.
How are new connections load balanced?
Refer to the exhibit.
A pool is contoured with four members. A user has a currentconnection established with 10.18.1.40. The virtual server has a persistence Profile configured.
Which log file should the BIG-IP Administrator check to determine if a specific user tried to log in to the 8IG-IP Configuration by utility?
Refer to the exhibit
The network team creates a new VLAN on the switches. The BIG-IP Administrator needs to create a
configuration on the BIG-IP device. The BIG-IP Administrator creates a new VLAN and Self IP, but the
servers on the new VLAN are NOT reachable from the BIG-IP device.
Which action should the BIG-IP Administrators to resolve this issue?
An HA pair of LTM devices that load balance multiple HTTPS applications utilizes highly customized RAM Cache and compression profiles on each virtual server. The LTM Specialist who is administering the HA pair regularly observes entines in the log similar to the following:
tmm tmm I708S1 011e0002.4. sweeper_update: aggressive mode activated (117504/138240 pages)
No DoS attacks arc occurring. No user problems have been reported. Which step should the LTM Specialist take to help mitigate the issue?
A OneConnect profile is applied to a virtual server. The LTM Specialist would like the client source IP addresses within the 10.10.10.0/25 range to reuse an existing server side connection.
Which OneConnect profile source mask should the LTM Specialist use?
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?
-- Exhibit –
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Refer to the exhibit.
An administrator created a monitor to a pool member web server, which resulted in a pool member that is marked red. The administrator knows the web server is working when it is accessed from another computer.
What should the administrator do to correct the problem?
Which type of Virtual Server requires the use of a FastL4 profile?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
Which two items can be consolidated to simplify the LTM configuration? (Choose two.)
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 high-availability (HA) pair configuration uses only the hardwire serial cable connection to determine device state. A power outage occurs to the PDU powering the active unit. The standby unit takes over the active role as expected.
How is the peer unit able to determine the active unit is unavailable?
A Standard Virtual Server for a web application is configured with Automap for the Source Address Translation option. The original source address of the client must be known by the backend servers. What should the BIG-IP Administrator configure to meet this requirement?
A BIG-IP Administrator creates an HTTP Virtual Server using an iApp template. After the Virtual Server is
created, the user requests to change the destination IP addresses. The BIG-IP Administrator tries to
change the destination IP address from 10.1.1.1 to 10.2.1.1 in Virtual Server settings, but receives the
following error:
The application service must be updated using an application management interface
What is causing this error?
-- Exhibit –
-- Exhibit --
Refer to the exhibits.
How should the LTM Specialist minimize the configuration?
Exhibit.
The three VLANS shown provide connectivity to backend servers. The backend servers are being moved to unmanaged switches and require separate interfaces.
How should the F5 device interfaces be configured?
An LTM Specialist is troubleshooting an HTTP monitor. The pool member is accessible directly through a browser, but the HTTP monitor is marking the pool member as down.
GET / HTTP/1.1
HTTP/1.1 400 Bad Request
DatE. Tue, 23 Oct 2012 21:39:07 GTM
Server: Apache/2.2.22 (FreeBSD) PHP/5.4.4
mod_ssl/2.2.22 OpenSSL/0.9.8q DAV/2
Content-LengtH. 226
Connection: close
Content-TypE. text/html; charset=iso-8859-1
How should the LTM Specialist resolve this issue?
An application requires load balancing functionality. The application must beencrypted to the client.
Certain content must be manipulated by the following IRule:
Which set of profiles must be applied to the virtual server?
An LTM device load balances a pool of routers. The LTM device needs to verify pathavailability to an HTTP server with the IP address 192 168.10 10. located beyond the routers.
Which monitor type and parameters arc required?
While investigating the cause of a device failover, an LTM Specialist discovers the following events in /var/log/ltm:
01010029:5: Clock advanced by 518 ticks
01010029:5: Clock advanced by 505 ticks
01010029:5: Clock advanced by 590 ticks
01010029:5: Clock advanced by 568 ticks
01010029:5: Clock advanced by 1681 ticks
01010029:5: Clock advanced by 6584 ticks
01140029:5: HA daemon_heartbeat tmm fails action is failover and restart.
010c0026:5: Failover condition, active attempting to go standby.
Which issue caused the failover?
Traffic to a pool of SFTP servers that share storage must be balanced by an LTM device.
What are therequired profile and persistence settings for a standard virtual server?
Refer to the exhibit.
Which two pool members should be chosen for a new connection? (Choose two.)
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
A pair of LTM devices are deployed in a high-availability (HA) pair as the diagram shows. After inserting a new rule on the firewalls, the LTM devices become Standby. The rule drops all outbound sessions to the Internet. Only inbound connections are allowed from the Internet. There are no other changes to the environment.
What triggered the LTM device failover?
A failover event is recorded in the log messages:
Jan 01 00:00:50 BIG-IP notice sod[5855]: 01140029:5: HA proc_running tmm fails action is go offline and down links.
Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0050:5: Sod requests links down.
Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0054:5: Offline for traffic group /Common/traffic-group-1.
Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c003e:5: Offline
Jan 01 00:00:50 BIG-IP notice logger: /usr/bin/tmipsecd --tmmcount 4 ==> /usr/bin/bigstart stop racoon
Jan 01 00:00:50 BIG-IP info lacpd[5502]: 01160016:6: Failover event detected. (Switchboard failsafe disabled while offline)
Jan 01 00:00:51 BIG-IP err bcm56xxd[5296]: 012c0010:3: Failover event detected. Marking external interfaces down. bsx.c(3633)
Jan 01 00:00:51 BIG-IP info bcm56xxd[5296]: 012c0015:6: Link: 1.1 is DOWN
Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143c:5: Connection to CMI peer 10.0.0.3 has been removed
Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143a:5: CMI reconnect timer: enabled
Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 01071431:5: Attempting to connect to CMI peer 10.0.0.3 port 6699
What is the cause of the failover?
An LTM Specialist needs to rewrite text within an HTML response from a web server. A client is sending the following HTTP request:
GET / HTTP/1.1
Host: www.example.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-LanguagE. en-US,en;q=0.5
Accept-EncodinG. gzip, deflate
Cache-Control: no-cache
Connection: keep-alive
CookiE. somecookie=1
HTTP/1.1 200 OK
Server: Apache/2.2.15 (Unix)
Last-ModifieD. Wed, 12 Aug 2009 00:00:30 GMT
Accept-Ranges: bytes
Content-LengtH. 1063
X-Cnection: close
Content-TypE. text/html; charset=UTF-8
Vary: Accept-Encoding
Content-EncodinG. gzip
Connection: Keep-Alive
Although a stream profile has been added to the virtual server, the content within the HTTP response is NOT being matched and therefore NOT modified.
Which header field is contributing to the issue?
The 8IG-IP Administrator generates a qkview using "qkview -SO" and needs to transfer the output file via
SCP.
Which directory contains the output file?
An LTM Specialist needs to use the tmsh command to create a pool named http_pool with member
10.10.101:80 on an LTM device.
Which expression should the LTM Specialist use?
Exhibit.
An LTM Specialist needs to configure VS^HTTP and VS_DB for an online shopping site. The VS HTTP passes the client requests to the webservers. The webservers query the database serversthrough the VS_DB. Initially, the LTM Specialist finds the database servers directly return the packets to the webservers.
which setting must be enabled for the configuration to function correctly?
A BIG-IP Administrator creates a new VLAN on BIG-IP Cluster Member A and attaches an Interface to it. Although the Auto Config Sync is in place, the new VLAN does NOT show up on Cluster Member B. What should the BIG-IP Administrator do to ensure the new VLAN is configured on each Cluster Member?
An LTM Specialist with the Administrator role and terminal access of "tmsh" logs in via ssh and is in the Traffic Manager Shell. The LTM Specialist wants to enter the bash shell to review log files.
Which command does the LTM Specialist need to run to access the bash shell?
A virtual server with SNAT automap enabled selects pool member 10.20.0.10.443 for the server-side flow. The client side flow source IP is 192.168.0.10 .
Which source IP should be expected inthe server-side connection?
An F5 LTM Specialist needs to perform an LTM device configuration backup prior to RMA swap.
Which command should be executed on the command line interface to create a backup?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
A pair of LTM devices are configured for HA. The LTM Specialist observes from a capture that there is a successful connection from a client directly to a web server and an unsuccessful connection from a client via the LTM device to the same web server.
Which two solutions will solve the configuration problem? (Choose two.)
-- Exhibit --
-- Exhibit --
Refer to the exhibit.
A company uses a complex piece of client software that connects to one or more virtual servers (VS) hosted on an LTM device. The client software is experiencing issues. An LTM Specialist must determine the cause of the problem. The LTM Specialist has the tcpdump extract. The client loses connection with the LTM device.
Where is the reset originating?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
An LTM Specialist has a virtual server set up on the LTM device as per the exhibit. The LTM Specialist receives reports of intermittent issues. Some clients are connecting fine while others are failing to connect.
The LTM Specialist does a tcpdump on the relevant interfaces, with the following results extracted:
What is causing the intermittent issues?
-- Exhibit –
-- Exhibit --
Refer to the exhibits.
An LTM Specialist is reconfiguring a virtual server to redirect all clients to HTTPS. Testing reveals that the redirect is functioning incorrectly. As part of the troubleshooting process, the LTM Specialist performs a packet capture.
What is the issue?
What should an LTM Specialist configure on an LTM device to send AVR notification emails?
An application is making heavy use of a large, high-quality JPEG image file. An LTM Specialist needs to enhance page load times without increasing server load.
Which profile should be applied to the virtual server to perform this task?
An LTM Specialist needs to rewrite text within an HTML response from a web server. A client is sending the HTTP request below:
GET / HTTP/1.1
Host: www.f5.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-LanguagE. en-US,en;q=0.5
Accept-EncodinG. gzip, deflate
Cache-Control: no-cache
Connection: keep-alive
CookiE. somecookie=1
Although a stream profile has been added to the virtual server, the content within the HTTP response is NOT being matched, and therefore NOT modified.
Which HTTP header should the LTM Specialist remove from the request to ensure the content can be matched and modified?
Users are experiencing low throughput when downloading large files over a high-speed WAN connection. Extensive packet loss was found to be an issue but CANNOT be eliminated.
Which two TCP profile settings should be modified to compensate for the packet loss in the network? (Choose two.)
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 BIG-IP Administrator is setting up a new BIG-IP device. The network administrator reports that the interface has an incompatible media speed. The BIG-IP Administrator needs to change this setting
manually.
From which location should the BIG-IP Administrator perform this task?
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers.
Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server?
An application is configured on an LTM device:
Virtual server: 10.0.0.1:80 (VLAN vlan301)
SNAT IP: 10.0.0.1
Pool members: 10.0.1.1:8080, 10.0.1.2:8080, 10.0.1.3:8080 (VLAN vlan302)
Which packet capture should the LTM Specialist perform on the LTM device command line interface to capture only client traffic specifically for this virtual server?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
A company uses a complex piece of client software that connects to one or more virtual servers (VS) hosted on an LTM device. The client software is experiencing issues. An LTM Specialist is tasked with finding the cause of the problem.
The LTM Specialist has the tcpdump extract and knows the client software has at least one connection to a VS on port 1990. However, when a tcpdump runs on the internal VLAN, there is no record of port 1990 in the tcpdump.
Why is there no record of port 1990 in the tcpdump?
Given:
Filesystem Size Used Avail Use% Mounted on
/dev/md11 248M 248M 0 100% /
/dev/md13 3.0G 76M 2.8G 3% /config
/dev/md12 1.7G 1.1G 476M 71% /usr
/dev/md14 3.0G 214M 2.6G 8% /var
/dev/md0 30G 2.2G 26G 8% /shared
/dev/md1 6.9G 288M 6.3G 5% /var/log
none 3.9G 452K 3.9G 1% /dev/shm
none 3.9G 19M 3.9G 1% /var/tmstat
none 3.9G 1.2M 3.9G 1% /var/run
prompt 4.0M 12K 4.0M 1% /var/prompt
/dev/md15 12G 8.3G 3.1G 74% /var/lib/mysql
Which command is used to produce this output?
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status
An LTM Specialist needs to create an iRule that creates persistence records based on a JSESSIONID cookie. If a persistence record already exists, then the iRule must persist the client connection according to the existing record.
Which persistence profile enables the iRule to meet these requirements?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
A web application is configured to allow sessions to continue even after a user computer is shut down for the night. A new LTM device is configured to load balance the web application to several servers. The application owner reports that application users are logged out of the web application whenever their browser is restarted or computer is rebooted.
What is the problem?
An HTTP 1.1 application utilizes chunking.
Which header should be used to notify the client's browser that there are additional HTTP headers at the end of the message?
An LTM device needs an additional traffic group.
Which configuration item is required?
An LTM Specialist needs to loadbalance an application using an LTM device to meet the requirements:
The application servers do NOT Support SSL, but client access to the application should be secured.
Multiple requests from the same client should be sent to the same pool member.
All pool members will have roughly the same processing power, and traffic should be distributed evenly.
The LTM device is NOT the pool members' default gateway.
which configuration should the LTM Specialist.
-- Exhibit –
-- Exhibit --
Refer to the exhibits.
Which URL on which server is causing the highest latency for users?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
Which URL should be reported to the server/application team as getting user-visible errors?
A BIGJP Administrator needs to load a UCS file but must exclude the license file. How should the administrator perform this task?
An LTM Specialist uploaded new releases .iso and .md5 files titled "BIGIP-FILENAME" via the GUI.
Which commands are run via the command line from the root directory to verify the integrity of the new .iso file?
A virtual server is using a TCP profile based on thetop-wan-optimized profile for a streaming application Users report videos are loading slowly.
Which setting should be modified in the TCP profile to optimize the application?
-- Exhibit –
-- Exhibit --
Refer to the exhibit.
Which step should an LTM Specialist take to utilize AVR?
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