1Y0-241 Sample Questions Answers

https://docs.citrix.com/en-us/citrix-adc/current-release/admin-partition.html

Correct Answer: D. Purchase a Citrix ADC SDX appliance, and configure a Citrix ADC instance for each

Short Explanation with reference:

A Citrix ADC SDX appliance is a multi-tenant platform that allows the Citrix Administrator to create and manage multiple Citrix ADC instances on a single hardware device. Each instance is isolated and dedicated to a specific tenant or application, and can have its own resources, configuration, and features. A Citrix ADC SDX appliance can support up to 80 instances, depending on the model and license. A Citrix ADC SDX appliance can also provide high performance and scalability, as it can deliver up to 100 Gbps of throughput.

Therefore, to meet the needs of the newly acquired companies, the administrator can purchase a Citrix ADC SDX appliance, and configure a Citrix ADC instance for each company. This will give each company its own Citrix ADC for VPN access load balancing, and a minimum of 20 Gbps of throughput, as well as other benefits such as security, optimization, and availability.

Citrix ADC SDX data sheet : Citrix ADC SDX at a glance

https://docs.citrix.com/en-us/citrix-adc/current-release/load-balancing/load-balancing-advanced-settings/graceful-shutdown.html

https://docs.citrix.com/en-us/citrix-adc/current-release/load-balancing/load-balancing-builtin-monitors/monitor-ldap-services.html

https://docs.citrix.com/en-us/citrix-adc/current-release/system/high-availability-introduction/troubleshooting-high-availability.html

https://training.citrix.com/public/Exam%20Prep%20Guides/231/1Y0-231_Exam_Preparation_Guide_v01.pdf

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

https://docs.citrix.com/en-us/citrix-adc/current-release/content-switching/protecting-against-failure.html#configuring-a-redirection-url

“If a content switching virtual server is configured with both a backup virtual server and a redirect URL, the backup virtual server takes precedence over the redirect URL. A redirect URL is used when the primary and backup virtual servers are down.”

A sysadmin is lower than a superuser is terms of access allowed on the appliance. A sysadmin user can perform all Citrix ADC operations with the following exceptions: no access to the Citrix ADC shell, cannot perform user configurations, cannot perform partition configurations, and some other configurations as stated in the sysadmin command policy https://docs.citrix.com/en-us/citrix-adc/current-release/system/authentication-and-authorization-for-system-user/user-usergroups-command-policies.html

https://support.citrix.com/article/CTX120660

https://docs.citrix.com/en-us/citrix-adc/current-release/appexpert/rewrite/rewrite-action-policy-examples/example-mask-http-server-type.html

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]

To put a compression policy into effect, you must bind it either globally, so that it applies to all traffic that flows through the Citrix ADC, or to a specific virtual server, so that the policy applies only to requests whose destination is the VIP address of that virtual server.

By default, compression is disabled on the Citrix ADC. You must enable the feature before configuring it. You can enable it globally so that it applies to all HTTP and SSL services, or you can enable it just for specific services.

https://docs.citrix.com/en-us/citrix-adc/current-release/load-balancing/load-balancing-advanced-settings/enable-compression-on-service.htm

Correct Answer: B. Content switching vServer, C. Default global, and D. Policy label

Short Explanation with reference:

A URL transformation policy is a set of rules that defines how the Citrix ADC appliance modifies the URLs in the requests and responses that it processes. A URL transformation policy can be bound to different bind points, depending on the scope and order of evaluation that the administrator wants to achieve. The possible bind points for a URL transformation policy are:

• Content switching vServer: This bind point applies the policy to all the requests and responses that are processed by the content switching virtual server. This is useful when the administrator wants to perform URL transformation based on the content type or domain name of the request.
• Default global: This bind point applies the policy to all the requests and responses that are processed by the appliance, regardless of the virtual server or service. This is useful when the administrator wants to perform URL transformation for all the traffic that passes through the appliance.
• Policy label: This bind point applies the policy to a group of requests and responses that are redirected to a policy label by another policy. This is useful when the administrator wants to perform URL transformation based on some criteria other than content type or domain name, such as HTTP method, header, or cookie.

Therefore, the correct answer is B. Content switching vServer, C. Default global, and D. Policy label.

Configuring URL Transformation | NetScaler : Bind points for policies | NetScaler 14.1

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.

During startup of a virtual server, or whenever the state of a virtual server changes, the virtual server can initially use the round-robin method to distribute the client requests among the physical servers. This type of distribution, referred to as startup round robin, helps prevent unnecessary load on a single server as the initial requests are served. After using the round-robin method at the startup, the virtual server switches to the loadbalancing method specified on the virtual server

Correct Answer: D. Round-robin

Short Explanation with reference:

A load-balancing vServer is a virtual server that distributes the incoming traffic among a group of services that provide the same content or functionality. A load-balancing vServer can use different load-balancing methods to select the best service for each request, based on various criteria, such as availability, performance, or load. The least bandwidth load-balancing method selects the service that is currently handling the least amount of traffic, measured in megabits per second.

However, during the startup of a vServer, the least bandwidth load-balancing method is not used by default. This is because the Citrix ADC appliance does not have enough data to calculate the bandwidth usage of each service at the beginning. Therefore, the appliance uses the round-robin load-balancing method by default, which selects the services in a circular order, without any weighting or priority. The round-robin load-balancing method is also used as a fallback method when other load-balancing methods fail or are not applicable.

Therefore, the correct answer is D. Round-robin.

Load balancing methods | NetScaler : How Load Balancing Methods Work - Citrix Customer Support

Correct Answer: D.

Short Explanation with reference:

A rewrite policy is a set of rules that defines how the Citrix ADC appliance modifies the requests and responses that it processes. A rewrite policy consists of an expression that evaluates to true or false, and an action that specifies what modification to perform. A rewrite action can use the replace_all function to replace all occurrences of a pattern in a string with another string.

In an SSL offload deployment, the Citrix ADC appliance terminates the SSL traffic from the clients and forwards the clear text traffic to the servers. This can cause a problem if the response body from the servers contains URLs that start with “http://”, as they will not match the protocol of the original request, which was “https://”. To fix this problem, the administrator can use a rewrite policy to modify all URLs in the response body from “http://” to “https://”.

The correct policy for this task is D, as it uses the replace_all function to replace all occurrences of “http://” with “https://” in the HTTP response body. The other policies are incorrect, as they either use the wrong pattern or the wrong replacement string. For example, policy A replaces “https://” with “http://”, which is the opposite of what is required. Policy B uses an incorrect escape character (“ ") before the colon (”:“) in both the pattern and the replacement string. Policy C uses a space (” “) instead of a colon (”:") in the replacement string.

Configuring rewrite actions | NetScaler

https://developer-docs.citrix.com/projects/citrix-adc-advanced-policy-expression-reference/en/latest/

Correct Answer: C. CLIENT and D. DNS

Short Explanation with reference:

When creating advanced policies, you can use the following expression prefixes: HTTP, SYS, CLIENT, SERVER, DNS, DATE, TIME, and URL1. TCP and IP are not valid prefixes for advanced policies2. SQL is not a supported feature for advanced policies3.

1: Summary examples of advanced policy expressions and policies - NetScaler 2: Configure advanced policy infrastructure | AppExpert - NetScaler 3: Shift your gears to Advanced policy infrastructure in Citrix ADC

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

- Pol1 has a prio of 90 so it's evaluated first

-gotoPrioExpression NEXT means that it will evaluate next item in the policy list

- Pol2 has a prio of 100, so it"s avaluated after Pol1