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NEW QUESTION # 50
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters are stateless.
- B. Firewall filters are stateful.
- C. Firewall filters can match Layer 7 parameters.
- D. Firewall filters can match Layer 4 parameters.
Answer: A,D
Explanation:
Firewall filters in Junos OS are stateless, meaning they process each packet individually without regard to the state of a connection or sequence of packets. These filters can match various packet attributes, including those at Layer 4, such as TCP and UDP port numbers. This allows for granular control over traffic based on the type of service or application. Unlike stateless filters, stateful firewalls keep track of the state of active connections and make decisions based on the context of the traffic flow, which is not a capability of Junos firewall filters. Additionally, Junos firewall filters primarily operate up to Layer 4 and do not natively inspect Layer 7 parameters, which involve application-level data.
NEW QUESTION # 51
Which two statements apply to the Routing Engine functions? (Choose two.)
- A. It does not process routing updates.
- B. It maintains the routing tables.
- C. It responds to ping and traceroute commands.
- D. It processes the transit traffic.
Answer: B,C
Explanation:
The Routing Engine (RE) in Juniper Networks devices plays a critical role in the control plane operations. One of its functions includes responding to network utility commands like ping and traceroute, which are essential for diagnosing network connectivity and path issues. Furthermore, the RE is responsible for maintaining the routing tables, which contain information about network paths and destinations. These tables are vital for making forwarding decisions but are distinct from the actual forwarding of packets, which is handled by the Packet Forwarding Engine (PFE).
NEW QUESTION # 52
Which three benefits occur when operating an interior gateway protocol (IGP) in an autonomous system (AS)? (Choose three.)
- A. IGPs automatically distribute static routing information.
- B. IGPs learn everything about the subnets and best paths within your network.
- C. IGPs determine the optimal paths for data transmission.
- D. IGPs react very fast to network change.
- E. IGPs learn prefixes in the global Internet's routing table.
Answer: B,C,D
Explanation:
Operating an Interior Gateway Protocol (IGP) within an Autonomous System (AS) provides several benefits, including determining the optimal paths for data transmission (B), reacting quickly to network changes (D), and learning all about the subnets and best paths within the network (E). IGPs are designed to manage routing within a single AS efficiently, adapting to changes and ensuring data is routed through the best available paths.
NEW QUESTION # 53
You have logged on to a Junos device and are at the operational mode prompt.
Which two commands are used at this prompt? (Choose two.)
- A. run show interface terse
- B. set interface ge-0/0/0 unit 0 family inet
- C. request system shutdown
- D. show interface ge-0/0/0
Answer: C,D
Explanation:
At the operational mode prompt on a Junos device, you can use various commands to view the device's status and request system operations. The show interface ge-0/0/0 command is used to display information about a specific interface, while the request system shutdown command is used to properly shut down the device.
The set command is used in configuration mode, not operational mode, and the run command is used to execute operational mode commands from configuration mode.
NEW QUESTION # 54
What is the protocol data unit (PDU) of the Data Link Layer?
- A. bit
- B. frame
- C. byte
- D. segment
Answer: B
Explanation:
In the OSI model, the Data Link Layer is responsible for node-to-node delivery of data. It frames the packets received from the Network Layer and prepares them for physical transmission. The Protocol Data Unit (PDU) for the Data Link Layer is called a "frame." Frames encapsulate the network layer packets, adding a header and a trailer that include the hardware addresses of the source and destination, among other things, facilitating the data link layer services like frame synchronization, flow control, and error checking.
NEW QUESTION # 55
You configured your system authentication order using the set authentication-order tacplus radius password command.
Which statement is correct in this scenario?
- A. All authentication methods are used with the most restrictive permission set used.
- B. The password authentication will only be used if the TACACS+ and RADIUS servers fail to respond.
- C. The password authentication method is evaluated if the TACACS+ and RADIUS servers respond with a reject message.
- D. A rejection by TACACS+ will prevent a login and bypass the other two authentication methods.
Answer: B
Explanation:
In the scenario where the system authentication order is set to "tacplus radius password," the correct statement is (B). If the TACACS+ and RADIUS servers are unreachable or fail to respond, the system will fall back to using password authentication. This ensures that users can still authenticate using locally stored passwords if external authentication servers are unavailable.
NEW QUESTION # 56
When considering routing tables and forwarding tables, which two statements are correct? (Choose two.)
- A. The forwarding table is used by the RE to select the best route.
- B. The forwarding table stores all routes and prefixes from all protocols.
- C. The routing table is used by the RE to select the best route.
- D. The routing table stores all routes and prefixes from all protocols.
Answer: C,D
Explanation:
The routing table and forwarding table play distinct roles in a Junos OS device. The correct answers are A and D.
The routing table (A) is used by the Routing Engine (RE) to select the best route among all the learned routes, while the routing table (D) stores all routes and prefixes learned from all routing protocols. The forwarding table, in contrast, contains only the active routes chosen by the RE and is used by the Packet Forwarding Engine for actual packet forwarding.
NEW QUESTION # 57
You received a new Junos device and are configuring the system-related settings. You must configure this device for the current date and time on the US West coast. You have set the time zone to America/Los_Angeies. however the time and date did not change.
In this scenario, which two additional actions would satisfy this requirement? (Choose two.)
- A. Configure a DNS server.
- B. Reboot the device.
- C. Configure an NTP server.
- D. Set the date and time setting manually.
Answer: C,D
Explanation:
When configuring the system-related settings for the current date and time on a Junos device, especially for a specific time zone like America/Los_Angeles, and the time does not automatically adjust, two effective actions can be taken. Firstly, setting the date and time manually allows for immediate correction of the system clock. This can be done via the CLI with the appropriate set date and time command. Secondly, configuring the device to use an NTP server can provide ongoing synchronization with an accurate time source, ensuring that the device maintains the correct time and date automatically in the future, even in the case of restarts or minor drifts in the internal clock.
NEW QUESTION # 58
Which two statements are true about the PFE? (Choose two.)
- A. The PFE implements various services such as policing, stateless firewall filtering, and class of service.
- B. The PFE handles all processes that control the chassis components.
- C. The PFE is responsible for performing protocol updates and system management.
- D. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
Answer: A,D
Explanation:
The Packet Forwarding Engine (PFE) in Juniper Networks devices is the heart of the data plane, handling the actual forwarding of packets based on pre-computed forwarding tables. It provides several critical services to manage and control traffic flow, including policing (to enforce bandwidth limits for certain traffic types), stateless firewall filtering (to permit or deny traffic based on predefined criteria), and Class of Service (CoS) (to prioritize traffic to ensure quality of service for critical applications). The PFE utilizes both Layer 2 (MAC addresses) and Layer 3 (IP addresses) forwarding tables to make intelligent forwarding decisions, ensuring that packets are efficiently routed toward their final destination.
NEW QUESTION # 59
You are logged in to a Junos OS device with SSH and issued the show protocols | compare command in the configuration, but no output is shown.
Which statement is correct in this scenario?
- A. Someone accidentally deleted the active configuration.
- B. There are no changes to the candidate configuration.
- C. You must commit the configuration before any output will be shown.
- D. The command only works for interface configuration differences.
Answer: B
Explanation:
If issuing the "show | compare" command in configuration mode yields no output, it indicates that there are no changes to the candidate configuration (B). This command is used to compare the current candidate configuration with the active configuration, and a lack of output suggests that the candidate configuration matches the active one, meaning no changes have been made or the changes have already been committed.
NEW QUESTION # 60
Which process in the Junos OS is responsible for device management tasks including the CLI and commit operations?
- A. rpd
- B. mgd
- C. dcd
- D. chassisd
Answer: B
Explanation:
In Junos OS, the management daemon (mgd) is responsible for handling all the device management tasks, including processing CLI commands and handling commit operations. The mgd daemon interacts with the Junos OS configuration database and provides the necessary logic to ensure that configuration changes are syntactically correct and do not conflict with each other. When a user commits a configuration, mgd validates the changes, applies them to the running configuration, and ensures that the necessary daemons are notified of the changes to apply them accordingly.
NEW QUESTION # 61
Which command displays all IPv6 routes in the default routing instance?
- A. show route table inet.0
- B. show route table inet.1
- C. show route table inet6.1
- D. show route table inet6.0
Answer: D
Explanation:
The show route table inet6.0 command displays all IPv6 routes in the default routing instance. In Junos OS, the routing table for IPv6 addresses is referred to as inet6.0, whereas inet.0 is used for IPv4 unicast routes. The other options do not correspond to the correct IPv6 routing table.
Reference:
Juniper official documentation: Junos OS Routing Tables Overview.
NEW QUESTION # 62
Which two statements are true about the Junos OS? (Choose two.)
- A. Routing tables are stored in the forwarding plane.
- B. Exception traffic is never sent to the control plane.
- C. Routing tables are stored in the control plane.
- D. Exception traffic is sent to the control plane.
Answer: C,D
Explanation:
In Junos OS, as with many network operating systems, the control plane is responsible for processes that determine how to route traffic. This includes maintaining routing tables, which store information about network paths and protocols. Therefore, routing tables are indeed stored in the control plane.
Exception traffic refers to packets that cannot be processed by the normal fast-path processing of the Packet Forwarding Engine (PFE) in the forwarding plane, and thus are sent to the control plane for further processing.
This might include packets destined for the router itself, packets that need to be fragmented, or packets that match certain firewall filter criteria, among other reasons.
Routing tables are not stored in the forwarding plane. However, the forwarding plane contains the forwarding table (sometimes referred to as the forwarding informationbase or FIB), which is a distilled version of the routing table optimized for fast packet forwarding. The forwarding plane uses this information to perform the actual transfer of packets across the network device interfaces.
NEW QUESTION # 63
Which two statements are correct about a Routing Engine? (Choose two.)
- A. It maintains routing tables.
- B. It processes management traffic.
- C. It processes CoS marked traffic.
- D. It forwards transit traffic.
Answer: A,B
Explanation:
The Routing Engine (RE) in Juniper Networks devices plays a pivotal role in the control plane, handling tasks that are critical for the operation and management of the network. One of its key functions is processing management traffic, which includes user commands, system configuration, and monitoring operations. The RE also maintains routing tables, which are essential for network routing decisions. These tables contain network topology information and routing paths, which the RE uses to update the Packet Forwarding Engine (PFE) so that it can forward packets appropriately. The RE does not forward transit traffic or process Class of Service (CoS) marked traffic, as these tasks are handled by the PFE.
NEW QUESTION # 64
Exhibit
term limit-icmp { from {
source-address {
172.25.11.0/24;
}
protocol icmp;
}
then {
count count-icmp; discard;
}
}
Referring to the exhibit, which two actions will occur when a packet matches the firewall filter? (Choose two.)
- A. The packet will be discarded.
- B. A counter will be incremented.
- C. The packet will be forwarded.
- D. An ICMP destination unreachable message will be returned.
Answer: A
Explanation:
Referring to the firewall filter configuration in the exhibit, when a packet matches the specified term limit-icmp, two actions are defined in thethenstatement:count count-icmpanddiscard. Thecount count-icmp action means that each time a packet matches this term, a counter namedcount-icmpwill be incremented, providing a tally of how many packets have matched the term. Thediscardaction means that the packet will be dropped and not forwarded through the device. This effectively prevents the packet from reaching its intended destination. There is no action specified that would cause an ICMP destination unreachable message to be returned, nor is there any action that would allow the packet to be forwarded.
NEW QUESTION # 65
Which two components are included in a transport header? (Choose two.)
- A. source MAC address
- B. source port number
- C. destination port number
- D. destination MAC address
Answer: B,C
NEW QUESTION # 66
Which protocol would you configure to synchronize the time and date on a Junos device?
- A. RIP
- B. NMP
- C. NTP
- D. SNMP
Answer: C
Explanation:
The Network Time Protocol (NTP) is designed to synchronize the clocks of computers over a network.
Configuring NTP on a Junos device ensures that its clock is set accurately, which is crucial for logging, troubleshooting, and maintaining the integrity of time-sensitive operations and security protocols. NTP allows devices to use a hierarchy of time sources, from primary servers synchronized to a reference clock (such as an atomic clock or GPS time) to secondary servers that distribute the time to other devices on the network.
NEW QUESTION # 67
What will the request system configuration rescue save command do?
- A. It saves the candidate configuration as the rescue configuration.
- B. It saves the most recently committed configuration as the rescue configuration.
- C. It activates the rescue configuration.
- D. It saves a configuration version prior to the configuration most recently committed as the rescue configuration.
Answer: B
Explanation:
The "request system configuration rescue save" command in Junos OS saves the most recently committed configuration as the rescue configuration, making A the correct answer. This feature allows administrators to set a known good configuration that can be quickly reverted to in case of configuration errors or issues.
NEW QUESTION # 68
Which command displays all IPv6 routes in the default routing instance?
- A. showroute table inet.l
- B. showroute table inet6.1
- C. showroute table inet.0
- D. showroute table inet6.0
Answer: D
Explanation:
In Junos OS, the command to display IPv6 routes in the default routing instance isshow route table inet6.0.
The routing tableinet6.0specifically holds IPv6 routes. The commandshow route table inet.0is used for IPv4 routes, andinet6.1orinet.l(assuminginet.lis a typo forinet.1) are not standard Junos routing tables for displaying IPv6 routes in the default routing instance.
NEW QUESTION # 69
Which advantage is provided by multiple software processes running in the Junos OS?
- A. Each process dependency can be mapped independently.
- B. Each process is started manually to ensure system stability.
- C. Each process allocates a fixed amount of CPU resources.
- D. Each process runs in a protected memory space.
Answer: D
Explanation:
In the Junos OS, multiple software processes run independently in their own protected memory spaces. This design ensures that if one process crashes or encounters an issue, it does not affect the other processes running on the system. This architecture enhances the stability and reliability of the network device, as each process operates independently and securely.
NEW QUESTION # 70
You are logged in to a Junos OS device with SSH and issued the show protocols | compare command in the configuration, but no output is shown.
Which statement is correct in this scenario?
- A. Someone accidentally deleted the active configuration.
- B. There are no changes to the candidate configuration.
- C. You must commit the configuration before any output will be shown.
- D. The command only works for interface configuration differences.
Answer: B
Explanation:
The show | compare command in Junos OS is used to display the differences between the candidate configuration and the active configuration. If no output is shown when you issue this command, it means that there are no changes between the candidate configuration and the active configuration. This indicates that the candidate configuration is identical to the active configuration, and thus no differences are displayed.
NEW QUESTION # 71
You are asked to convert the number 7 from decimal to binary.
Which number is correct in this scenario?
- A. 0
- B. 00001000
- C. 00010000
- D. 00000111
Answer: D
Explanation:
To convert the decimal number 7 to binary, the correct representation is 00000111 (C). In binary, 7 is represented as 1+2+4 (2^0 + 2^1 + 2^2), which corresponds to the last three digits being 1 in the binary format, with leading zeros added for clarity.
NEW QUESTION # 72
Exhibit
user@router> show route 192.168.100.2
inet.O: 15 destinations, 17 routes (15 active, 0 holddown, 0 hidden) Limit/Threshold: 1048576/1048576 destinations
+ = Active Route, - = Last Active, * = Both 192.168.100.2/32*[OSPF/IO] 00:14:29, metric 1
> to 172.16.1.6 via ge-0/0/1.0 [BGP/170] 00:06:49, localpref 100
AS path: 65102 I, validation-state: unverified > to 172.16.1.6 via ge-0/0/1.0 Referring to the exhibit, which statement is correct?
- A. The BGP route is preferred over the OSPF route.
- B. The BGP path is the only active route.
- C. / Traffic is load-balanced across two routes.
- D. The OSPF path is the only active route.
Answer: D
Explanation:
Referring to the exhibit, the presence of the "+" symbol next to the OSPF route for 192.168.100.2/32 indicates that this is the active route being used to forward traffic. The BGP route, although present, does not have the
"+" symbol, indicating it is not the active route. In Junos OS, the routing table displays the active route with a
"+" symbol, and the fact that the OSPF route has this symbol means it is the preferred path based on the routing protocol'sdecision process, which takes into account factors such as route preference (administrative distance) and metrics.
NEW QUESTION # 73
Click the Exhibit button.
Referring the exhibit, what does the highlighted number indicate?
- A. route preference is 5
- B. hop count is 5
- C. cost is 5
- D. metric is 5
Answer: A
Explanation:
In the exhibit shown, the highlighted number next to the route type (Static) within the square brackets indicates the route preference, also known as the administrative distance. In Junos, the route preference is a value that determines the priority of the route source. Lower numbers indicate a higher priority when the routing table is being calculated. The route preference is used to select the best route when multiple paths to the same destination exist from different routing sources. The number 5 is unusually low for a static route by default, suggesting it has been manually configured to override other route types.
NEW QUESTION # 74
Which two statements are true about the Junos OS? (Choose two.)
- A. Routing tables are stored in the forwarding plane.
- B. Exception traffic is never sent to the control plane.
- C. Routing tables are stored in the control plane.
- D. Exception traffic is sent to the control plane.
Answer: C,D
Explanation:
In Junos OS, as with many network operating systems, the control plane is responsible for processes that determine how to route traffic. This includes maintaining routing tables, which store information about network paths and protocols. Therefore, routing tables are indeed stored in the control plane.
Exception traffic refers to packets that cannot be processed by the normal fast-path processing of the Packet Forwarding Engine (PFE) in the forwarding plane, and thus are sent to the control plane for further processing. This might include packets destined for the router itself, packets that need to be fragmented, or packets that match certain firewall filter criteria, among other reasons.
Routing tables are not stored in the forwarding plane. However, the forwarding plane contains the forwarding table (sometimes referred to as the forwarding information base or FIB), which is a distilled version of the routing table optimized for fast packet forwarding. The forwarding plane uses this information to perform the actual transfer of packets across the network device interfaces.
NEW QUESTION # 75
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