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F5 301b - LTM Specialist: Maintain & Troubleshoot

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Total 209 questions

An LTM Specialist has a single HTTPS virtual server doing SSL termination. No server SSL profile is defined. The pool members are on the internal VLAN answering on HTTP port 80. Users with certain browsers are experiencing issues.

Which two locations are most appropriate to gather packets needed to determine the SSL issue? (Choose two.)

A.

server interface

B.

user's computer

C.

LTM device's external VLAN

D.

LTM device's internal VLAN

E.

LTM device's management interface

A customer needs to intercept all of the redirects its application is sending to clients. When a redirect is matched, the customer needs to log a message including the client IP address.

Which iRule should be used?

A.

when HTTP_RESPONSE {

if { [HTTP::is_3xx] } {

log local0. "redirecting client ip address [IP::addr [IP::remote_addr]]"

}

}

B.

when HTTP_REQUEST {

if { [HTTP::is_301] } {

log local0. "redirecting client ip address [IP::addr [IP::remote_addr]]"

}

}

C.

when HTTP_REQUEST {

if { [HTTP::is_redirect] } {

log local0. "redirecting client ip address [IP::addr [IP::remote_addr]]"

}

}

D.

when HTTP_RESPONSE {

if { [HTTP::is_redirect] } {

log local0. "redirecting client ip address [IP::addr [IP::remote_addr]]"

}

}

An LTM Specialist is troubleshooting an issue where one LTM device in a three LTM device group is failing to synchronize after a synchronize to group command is issued. The LTM Specialist verifies there are no packet filters, port lock down, or network issues preventing the connection.

What are two reasons the synchronization group is having issues? (Choose two.)

A.

Certificates expired on all of the peer LTM devices.

B.

Certificates stored for the device trusts on all of the peer LTM devices are corrupted.

C.

Admin passwords changed on one of the peer LTM devices that are able to synchronize.

D.

Admin password changed on the LTM device NOT receiving the synchronized configurations.

E.

Certificates stored for the device trusts on the LTM device NOT receiving the configuration are corrupted.

-- 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. Return traffic bypasses the LTM device using Layer 2 nPath routing.

Which configuration change resolves this problem?

A.

Enable a SNAT pool on the LTM device.

B.

Disable address translation on the LTM device.

C.

Configure a route on the web server to the client subnet.

D.

Configure the virtual server to listen on port 80 on the LTM device.

E.

Configure the VIP address on the loopback interface of the web server.

Which iRule will reject any connection originating from a 10.0.0.0/8 network?

A.

when CLIENT_ACCEPTED {

set remote_ip [IP::addr [IP::remote_addr] mask 8]

switch $remote_ip {

"10.0.0.0" { reject }

"11.0.0.0" { pool pool_http1}

default { pool http_pool }

}

}

B.

when CLIENT_ACCEPTED {

set remote_ip [IP::addr [IP::local_addr] mask 8]

switch $remote_ip {

"10.0.0.0" { reject }

"11.0.0.0" { pool pool_http1}

default { pool http_pool }

}

}

C.

when CLIENT_ACCEPTED {

set remote_ip [IP::addr [IP::client_addr] mask 255.0.0.0]

switch $remote_ip {

"10.0.0.0" { reject }

"11.0.0.0" { pool pool_http1}

default { pool http_pool }

}

}

D.

when CLIENT_ACCEPTED {

set remote_ip [IP::addr [IP::local_addr] mask 255.0.0.0]

switch $remote_ip {

"10.0.0.0" { reject }

"11.0.0.0" { pool pool_http1}

default { pool http_pool }

}

}

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.

slow start

B.

proxy options

C.

proxy buffer low

D.

proxy buffer high

E.

Nagle's algorithm

-- 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?

A.

The redirect is causing an infinite loop.

B.

The virtual server is missing a clientssl profile.

C.

The redirect is sending the client to the incorrect location.

D.

The virtual server is incorrectly processing the HTTP request.

-- Exhibit –

-- Exhibit --

Refer to the exhibits.

Which URL on which server is causing the highest latency for users?

A.

/slow1.php on 172.16.20.3

B.

/slow2.php on 172.16.20.1

C.

/reflector.php on 172.16.20.2

D.

/Compress.HTML on 172.16.20.1

An LTM Specialist is troubleshooting an issue with a new virtual server. When connecting through the virtual server, clients receive the message "The connection was reset" in the browser, although connections directly to the pool member show the application is functioning correctly.

ltm pool srv1_https_pool {

members {

192.168.2.1:https{

address 192.168.2.1

}

}

}

ltm virtual https_example_vs {

destination 192.168.1.155:https

ip-protocol tcp

mask 255.255.255.255

pool srv1_https_pool

profiles {

http { }

tcp { }

}

snat automap

vlans-disabled

}

How should the LTM Specialist resolve this issue?

A.

Enable HTTP monitoring on the pool.

B.

Add a ClientSSL profile to the virtual server.

C.

Disable SNAT Automap on the virtual server.

D.

Remove the HTTP profile from the virtual server.

A new web application is hosted at www.example.net, but some clients are still pointing to the legacy web application at www.example.com.

Which iRule will allow clients referencing www.example.com to access the new application?

A.

when HTTP_REQUEST {

if {[HTTP::host] equals "www.example.*" }{

HTTP::redirect "http://www.example.net" }

}

B.

when HTTP_REQUEST {

if {[HTTP::host] equals "www.example.com" }{

HTTP::redirect "http://www.example.net" }

}

C.

when HTTP_DATA {

if {[HTTP::host] equals "www.example.*" }{

HTTP::redirect "http://www.example.net" }

}

D.

when HTTP_RESPONSE {

if {[HTTP::host] equals "www.example.com" }{

HTTP::redirect "http://www.example.net" }

}