F5 301b 問題集

質問 1：
A new VLAN vlan301 has been configured on a highly available LTM device in partition ApplicationA. A new directly connected backend server has been placed on vlan301. However, there are connectivity issues pinging the default gateway. The VLAN self IPs configured on the LTM devices are 192.168.0.251 and 192.168.0.252 with floating IP
192.168.0.253. The LTM Specialist needs to perform a packet capture to assist with troubleshooting the connectivity.
Which command should the LTM Specialist execute on the LTM device command line interface to capture the attempted pings to the LTM device default gateway on VLAN vlan301?
A. tcpdump -ni /ApplicationA/vlan301 'host 192.168.0.253'
B. tcpdump -ni vlan301 'host 192.168.0.251 or host 192.168.0.252'
C. tcpdump -ni /ApplicationA/vlan301 'host 192.168.0.251 or host 192.168.0.252'
D. tcpdump -ni vlan301 'host 192.168.0.253'
正解：A

質問 2：
Given LTM device ltm log:
Sep 26 20:51:08 local/lb-d-1 notice promptstatusd[3695]: 01460006:5: semaphore mcpd.running(1) held
Sep 26 20:51:08 local/lb-d-1 notice promptstatusd[3695]: 01460006:5:
Sep 26 20:51:08 local/lb-d-1 warning promptstatusd[3695]: 01460005:4: mcpd.running(1) held, wait for mcpd
Sep 26 20:51:08 local/lb-d-1 info sod[3925]: 010c0009:6: Lost connection to mcpd reestablishing.
Sep 26 20:51:08 local/lb-d-1 err bcm56xxd[3847]: 012c0004:3: Lost connection with MCP: 16908291 ... Exiting bsx_connect.cpp(174)
Sep 26 20:51:08 local/lb-d-1 info bcm56xxd[3847]: 012c0012:6: MCP Exit Status Sep 26 20:51:08 local/lb-d-1 info bcm56xxd[3847]: 012c0012:6: Info: LACP stats (time now:1348717868) : no traffic
Sep 26 20:51:08 local/lb-d-1 info bcm56xxd[3847]: 012c0014:6: Exiting...
Sep 26 20:51:08 local/lb-d-1 err lind[3842]: 013c0004:3: IO error on recv from mcpd connection lost Sep 26 20:51:08 local/lb-d-1 notice bigd[3837]: 01060110:5: Lost connection to mcpd with
error 16908291, will reinit connection.
Sep 26 20:51:08 local/lb-d-1 err statsd[3857]: 011b0004:3: Initial subscription for system configuration failed with error '' Sep 26 20:51:08 local/lb-d-1 err statsd[3857]: 011b0001:3: Connection to mcpd failed with
error '011b0004:3: Initial subscription for system configuration failed with error '''
Sep 26 20:51:08 local/lb-d-1 err csyncd[3851]: 013b0004:3: IO error on recv from mcpd connection lost .............skipping more logs..... Sep 26 20:51:30 local/lb-d-1 notice sod[3925]: 01140030:5: HA proc_running bcm56xxd is
now responding.
Sep 26 20:51:34 local/lb-d-1 notice sod[3925]: 01140030:5: HA proc_running mcpd is now responding. Sep 26 20:51:34 local/lb-d-1 notice sod[3925]: 010c0018:5: Standby
Which daemon failed?
A. mcpd
B. lind
C. promptstatusd
D. bcm56xxd
E. sod
正解：A

質問 3：
An LTM Specialist configures two LTM devices in a high-availability pair with trusts established and device groups configured properly using network failover. After several months, the LTM Specialist notices that changes made to one LTM device do NOT cause the synchronization status to update to "changes pending," and this device does NOT synchronize with the device group.
Which two steps should the LTM Specialist take to identify the issue? (Choose two.)
A. Verify that the devices are not using self-signed certificates.
B. Verify the network connectivity between the devices.
C. Verify that port lockdown on the ConfigSync interface is set to allow port 1026.
D. Verify that ConfigSync is using the management IP address.
E. Verify that NTP is synchronized.
正解：B,E

質問 4：
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?
A. Add 'Connection: close\r\n' to the monitor's send string.
B. Change the HTTP version in the send string from HTTP/1.1 to HTTP/1.0.
C. Add '200 OK' to the monitor's receive string.
D. Change the interval on the monitor from 5 seconds to 30 seconds.
正解：B

質問 5：
-- Exhibit-

-- Exhibit -
Refer to the exhibits.
Users are able to access the application when connecting directly to the web server but are unsuccessful when connecting to the virtual server.
What is the cause of the application access problem?
A. The virtual server is NOT configured to listen on port 80.
B. The virtual server has address translation disabled.
C. The client has no route to the web server.
D. The web server is NOT responding on the correct port.
E. The virtual server has SNAT disabled.
正解：B

質問 6：
-- Exhibit- -- Exhibit -

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. However, the monitor is marking the member as down. The LTM Specialist captures the monitor traffic via tcpdump.
What is the issue?
A. The 'time-until-up' setting on the monitor is incorrect.
B. The server is marking the connection as closed.
C. The monitor request is NOT returning the page body.
D. The pool member is rejecting the monitor request.
正解：C

質問 7：
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?
A. Enable Datagram LB
B. Disable Datagram LB
C. Set Timeout to Indefinite
D. Set Timeout to Immediate
正解：A

質問 8：
-- 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 is seeing a client source IP of 168.210.232.5 in the tcpdump. However, the client source IP is actually 10.123.17.12.
Why does the IP address of 10.123.17.12 fail to appear in the tcpdump?
A. The Secure Network Address Translation (SNAT) pool on the virtual server is activated.
B. The individual's data stream is being routed to the LTM device by a means other than the default route.
C. Network Address Translation (NAT) has occurred in the path between the client and the LTM device.
D. The LTM device performed NAT on the individual's IP address.
正解：C

質問 9：
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?
A. bigpipe config save /var/tmp/backup.ucs
B. tmsh save /sys config ucs /var/tmp/backup.ucs
C. tmsh save /sys config /var/tmp/backup.ucs
D. tmsh save /sys ucs /var/tmp/backup.ucs
正解：D