1Y0-241 Deploy and Manage Citrix ADC with Traffic Management Questions and Answers

https://docs.citrix.com/en-us/citrix-adc/current-release/ssl/how-to-articles/end-to-end-encrypt.html

https://docs.citrix.com/en-us/citrix-adc/current-release/appexpert/rate-limiting/configuring-binding-traffic-rate-policy1.html

https://discussions.citrix.com/topic/398863-netscaler-rate-limiting-policy/

Correct Answer: C. POL_14

Short Explanation with reference:

The Citrix ADC appliance evaluates the rewrite policies in the order of their priority, from lowest to highest. The priority is a numerical value that indicates the relative importance of the policy. The lower the priority, the higher the importance. The gotoPriorityExpression is an expression that specifies the next policy to evaluate after the current policy is hit. The expression can be either a priority value or the keyword END, which indicates that no further policies are evaluated. Therefore, in this scenario, the policy evaluation order is as follows:

• POL_12 is hit first, as it has the lowest priority (90). It has a gotoPriorityExpression of NEXT, which means that the next policy in priority order is evaluated.
• POL_15 is evaluated next, as it has the next lowest priority (100). It has a gotoPriorityExpression of END, which means that no further policies are evaluated.
• POL_13 and POL_14 are not evaluated, as they have higher priorities (101 and 120) than POL_15, and POL_15 has a gotoPriorityExpression of END.

Therefore, the correct answer is C. POL_14, as it is the policy that is evaluated last, considering POL_12 is hit first.

Configuring rewrite policies | NetScaler : Policy binding and evaluation | NetScaler 14.1

https://docs.citrix.com/en-us/citrix-adc/current-release/load-balancing/load-balancing-custom-monitors/configure-user-monitor.html

Correct Answer: D. NSIP

Short Explanation with reference:

According to the Citrix documentation1, monitor probes originate from the NSIP address by default. However, if the subnet of a StoreFront server is different from that of the appliance, then the subnet IP (SNIP) address is used. Therefore, the correct answer is D. NSIP.

1: Citrix StoreFront stores monitoring | NetScaler 14.1

Correct Answer: D. CLIENT.IP.SRC IN_SUBNET(10.107.149.0/24) && (client.UDP.DSTPORT.EQ(53) || client.TCP.DSTPORT.EQ(53))

Short Explanation with reference:

An expression is a logical statement that evaluates to true or false, and can be used to match the required traffic for various purposes, such as filtering, rewriting, or load balancing. An expression can use different operators, functions, and values to specify the criteria for matching the traffic. Some of the common elements of an expression are:

• CLIENT.IP.SRC: This function returns the source IP address of the client request.
• IN_SUBNET: This operator checks whether an IP address belongs to a specified subnet.
• &&: This operator performs a logical AND operation between two expressions.
• ||: This operator performs a logical OR operation between two expressions.
• client.UDP.DSTPORT and client.TCP.DSTPORT: These functions return the destination port of the client request for UDP and TCP protocols, respectively.
• EQ: This operator checks whether two values are equal.

In this scenario, the administrator needs to block all DNS requests from subnet 10.107.149.0/24. DNS requests are typically sent over UDP or TCP protocols, and use port 53 as the destination port. Therefore, the expression that can match this traffic is:

CLIENT.IP.SRC IN_SUBNET(10.107.149.0/24) && (client.UDP.DSTPORT.EQ(53) || client.TCP.DSTPORT.EQ(53))

This expression evaluates to true if the source IP address of the client request is in the subnet 10.107.149.0/24, and the destination port of the client request is 53 for either UDP or TCP protocol.

The other options are incorrect, as they either use the wrong function, operator, or syntax for matching the traffic. For example, option A uses the SRC function instead of the IN_SUBNET operator, which will only match a single IP address instead of a subnet. Option B uses an incorrect delimiter (space) between the subnet address and mask, which will cause a syntax error. Option C uses parentheses incorrectly, which will change the order of evaluation and result in a different meaning.

Configuring expressions | NetScaler : How to Configure an Expression to Filter Traffic - Citrix Customer Support : How to Use Operators in Expressions - Citrix Customer Support

Correct Answer: B. Access Control List (ACL)

Short Explanation with reference:

An Access Control List (ACL) is a set of rules that can be used to allow or deny traffic to or from the Citrix ADC appliance1. A Citrix Administrator can use ACLs to restrict access to the NSIP address, which is the IP address used for management purposes2. By default, secure access to the NSIP address is enabled, but it can be disabled by using the -gui option in the CLI or by unchecking the Secure Access only check-box in the GUI2. Alternatively, a Citrix Administrator can also use the allowedManagementInterface parameter to define the list of permitted management interfaces for system users3.

1: Configuring ACLs | NetScaler 2: How to Enable Secure Access to Citrix ADC GUI Using the SNIP/MIP Address of the Appliance 3: Restricted system user authentication to NetScaler management interfaces

https://support.citrix.com/article/CTX236336/ns-105how-to-configure-snmp-trap-for-servicegroupentity-state-change

Free (default) License limits the number of managable objects.

Correct Answer: A. It replaces the date header in the HTTP response with the Citrix ADC system time in a conventional date format.

Short Explanation with reference:

A rewrite action is a set of rules that defines how the Citrix ADC appliance modifies the requests and responses that it processes. A rewrite action can use different parameters, such as target, expression, and pattern, to specify what part of the message to modify and how to modify it. The target parameter specifies the part of the message that is modified, such as the header or the body. The expression parameter specifies the new value that replaces the target. The pattern parameter specifies a string or a regular expression that matches the part of the target that is replaced.

In this scenario, the administrator configured a rewrite action as follows:

add rewrite action sync_date replace http.res.date.sys.time

This rewrite action uses the replace parameter, which replaces the entire target with the expression. The target is http.res.date, which is the date header in the HTTP response. The expression is sys.time, which is a built-in function that returns the Citrix ADC system time in a conventional date format, such as “Wed, 06 Sep 2023 12:45:12 GMT”. Therefore, this rewrite action replaces the date header in the HTTP response with the Citrix ADC system time in a conventional date format. This can be useful for synchronizing the time between the server and the client, or for preventing caching issues.

Therefore, the correct way to interpret this rewrite action is A. It replaces the date header in the HTTP response with the Citrix ADC system time in a conventional date format.

Configuring rewrite actions | NetScaler : How to Configure Rewrite Action - Citrix Customer Support : How to Use Built-in Functions in Expressions - Citrix Customer Support

https://docs.citrix.com/en-us/citrix-adc/current-release/global-server-load-balancing/how-to/configure-gslb-content-switch.html

"You are connected to the secondary node..." when first login to the NSIP and after saving the configuration

https://docs.citrix.com/en-us/citrix-adc/current-release/load-balancing/load-balancing-customizing-algorithms/leastbandwidth-method.html

https://support.citrix.com/article/CTX101990

https://docs.citrix.com/en-us/citrix-adc/12-1/appexpert/policies-and-expressions/ns-pi-intro-pol-exp-wrapper-con/ns-pi-adv-class-pol-con.html

"Once default SSL Profiles are enabled, you cannot disable the default SSL Profiles."

Correct Answer: A. MAC-based forwarding (MBF)

Short Explanation with reference:

MAC-based forwarding (MBF) is a mode on a Citrix ADC that can be used to avoid asymmetrical packet flows and multiple route/ARP lookups. MBF enables the Citrix ADC to forward packets based on the MAC address of the destination server, instead of the IP address. This way, the Citrix ADC does not need to perform routing or ARP resolution for each packet, which reduces the processing overhead and improves performance. MBF also ensures that the return traffic from the server follows the same path as the incoming traffic from the client, which avoids asymmetrical routing issues.

MBF can be enabled on a Citrix ADC by using the GUI or the CLI of the appliance. MBF can be applied to a specific service or a service group, or to all services on the appliance. MBF can also be used in conjunction with other features, such as direct server return (DSR) and link load balancing (LLB).

Therefore, option A is the correct answer.

References:

• [MAC-Based Forwarding]
• [Configuring MAC-Based Forwarding]
• [How to Configure MAC Based Forwarding on NetScaler Appliance]