[Jul 12, 2024] JN0-105 Ultimate Study Guide - Lead2PassExam
Ultimate Guide to Prepare JN0-105 Certification Exam for JNCIA in 2024
NEW QUESTION # 46
Which two components are included in a transport header? (Choose two.)
- A. destination MAC address
- B. destination port number
- C. source port number
- D. source MAC address
Answer: B,C
Explanation:
The transport layer in the OSI model is responsible for end-to-end communication and error recovery. In a transport header, such as TCP or UDP, the key components include the source port number and the destination port number. These port numbers are used to identify sending and receiving applications. The source port number indicates the port of the sending application, and the destination port number refers to the port of the receiving application. MAC addresses, on the other hand, are part of the data link layer (Layer 2) and would be included in an Ethernet header, not a transport header.
NEW QUESTION # 47
Which two statements are correct about a Routing Engine? (Choose two.)
- A. It maintains routing tables.
- B. It processes CoS marked traffic.
- C. It processes management traffic.
- D. It forwards transit traffic.
Answer: A,C
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 # 48
Which service does RADIUS provide?
- A. authentication
- B. DNS resolution
- C. time synchronization
- D. routing
Answer: A
Explanation:
RADIUS, which stands for Remote Authentication Dial-In User Service, provides authentication services for users trying to access a network. It is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service.
NEW QUESTION # 49
Click the Exhibit button.
Referring to the exhibit, OSPF has three export policies that match different static route prefixes. The
10.10.10.0/24 static route does not match any terms in the policyl routing policy.
What happens next in this scenario?
- A. Thestaticrouteisevaluated by the poiicy3 routing policy.
- B. Thestaticrouteisrejected by the policyl routing policy.
- C. Thestaticrouteisevaluated by the poiicy2 routing policy.
- D. Thestaticrouteisrejected by the default routing policy.
Answer: C
Explanation:
In Junos, when multiple policies are applied to a routing protocol for route export, the routes are evaluated in the order in which the policies are listed. In the exhibit, the OSPF configuration has three export policies listed: policy1, policy2, and policy3. The static route 10.10.10.0/24 does not match any terms in policy1; therefore, it is not rejected by policy1 but is instead passed on to the next policy in the sequence, which is policy2.
If the static route matches a term in policy2 that permits the route, it will be exported into OSPF. If it does not match in policy2, it will then be evaluated by policy3. If there is no match in policy3 as well, and assuming there are no more policies listed, the route would then be subject to the default routing policy behavior, which typically rejects the route unless an explicit accept statement is present in the policies.
NEW QUESTION # 50
Which two external authentication methods does Junos support for administrative access? (Choose two.)
- A. RADIUS
- B. ACE
- C. NIS
- D. TACACS+
Answer: D
Explanation:
Junos OS supports several external authentication methods for administrative access, with TACACS+ (Terminal Access Controller Access-Control System Plus) and RADIUS (Remote Authentication Dial-In User Service) being among the most commonly used. Both TACACS+ and RADIUS are protocols that allow network devices to communicate with a central authentication server, enabling centralized control over user authentication and authorization. This centralization simplifies the management of user credentials and access policies, especially in larger networks with multiple devices.
NEW QUESTION # 51
Your router has a route to the 10.1.1.0/24 network with a next hop of r jet.
In this scenario, which action will your router perform when traffic destined to the 10.1.1.0/24 network is received?
- A. The traffic will be discarded and an ICMP unreachable message will be sent to the destination of the traffic.
- B. The traffic will be redirected using a default route.
- C. The traffic will be silently discarded.
- D. The traffic will be discarded and an ICMP unreachable message will be sent to the source of the traffic.
Answer: C
Explanation:
In a scenario where a router has a route to a specific network (in this case, 10.1.1.0/24) with a next hop that is unreachable or incorrectly specified (e.g., "r jet" seems to be a typo or an undefined entity), the router will typically discard the traffic destined for that network. This action is taken because the router cannot determine a valid path to forward the traffic. Unlike some scenarios where the router might generate an ICMP (Internet Control Message Protocol) unreachable message, in many configurations, especially in production networks, the traffic might be silently discarded without providing feedback to the sender, as generating ICMP messages for all undeliverable packets could lead to additional network congestion and potential security concerns.
NEW QUESTION # 52
Which statement is correct concerning exception traffic processing?
- A. Exception traffic is never forwarded.
- B. Exception traffic is rate-limited to protect the RE.
- C. Exception traffic is always dropped during congestion.
- D. Exception traffic is discarded by the PFE.
Answer: B
Explanation:
Exception traffic refers to packets that the Packet Forwarding Engine (PFE) cannot process normally and must be forwarded to the Routing Engine (RE) for further processing. This includes packets destined for the router itself or packets needing special handling that the PFE cannot provide. To protect the RE from being overwhelmed by such traffic, which could potentially impact the router's control plane functions, exception traffic is rate-limited. This means that there's a threshold to how much exception traffic can be sent to the RE, ensuring that the router's critical management and control functions remain stable and responsive even during high traffic volumes or attacks.
NEW QUESTION # 53
Which character is used to filter the command output in the Junos CLI?
- A. |
- B. ?
- C. <
- D. >
Answer: A
Explanation:
In the Junos CLI, the pipe character | is used as a filter operator to refine command output. This operator can be combined with various filtering commands like match, except, count, etc., to display only the relevant portions of the command output. For example, using | match <pattern> filters the output to show only the lines that contain the specified pattern, making it easier to find specific information within extensive command output. This functionality is especially useful in managing and troubleshooting complex configurations and network states, allowing for more efficient analysis of the device's operational status and configuration details.
NEW QUESTION # 54
Your network infrastructure transports data, voice, and video traffic. Users are complaining that voice and video calls are not performing to their expectations.
In this scenario, which technology would you implement to improve voice and video performance on your network?
- A. NAT
- B. CoS
- C. IPv6
- D. STP
Answer: B
Explanation:
In a network that carries diverse types of traffic like data, voice, and video, ensuring the performance of latency-sensitive applications such as voice and video calls is crucial. Class of Service (CoS) is a technology designed to prioritize network traffic, ensuring that critical applications like voice and video receive the necessary bandwidth and minimal latency. CoS mechanisms can include traffic classification, traffic policing, queue management, and scheduling. By implementing CoS, network administrators can assign higher priority to voice and video traffic, thus improving their performance across the network and addressing the users' complaints about call quality.
NEW QUESTION # 55
What information would you find using the CLI help command?
- A. an explanation for specific system log error messages
- B. a URL for accessing the technical documentation
- C. hyperlinks for remediation actions
- D. message of the day
Answer: A
Explanation:
The CLI help command in Junos OS provides assistance and explanations for commands, command options, and in some cases, specific system log error messages. By using the help command followed by specific keywords or messages, users can get detailed information and context for the commands they are using or errors they are encountering. This feature is particularly useful for understanding the purpose of commands, their syntax, and troubleshooting error messages that may appear in system logs.
NEW QUESTION # 56
You are asked to view the real-time usage statistics for the busiest interfaces on a device running Junos OS.
Which command will achieve this task?
- A. monitor traffic
- B. monitor interface traffic
- C. monitor traffic absolute-sequence
- D. show interfaces extensive
Answer: B
Explanation:
To view real-time usage statistics for the busiest interfaces on a device running Junos OS, the correct command is B, "monitor interface traffic." This command provides a dynamic, real-time view of the traffic flowing through the interfaces, allowing administrators to quickly identify and monitor the busiest interfaces on the device.
NEW QUESTION # 57
You issue the telnet 10.10.10.1 source 192.168.100.1 command.
Which two statements are correct in this scenario? (Choose two.)
- A. The telnet session will have a destination address of 192.168.100.1.
- B. The telnet session will have a destination address of 10.10.10.1.
- C. The telnet session will have a source address of 10.10.10.1.
- D. The telnet session will have a source address of 192.168.100.1.
Answer: B,D
Explanation:
In the given telnet command, "telnet 10.10.10.1 source 192.168.100.1," the destination address of the telnet session is 10.10.10.1, and the source address of the session is specified as 192.168.100.1, making C and D the correct answers. This command instructs the telnet client to use the specified source IP address when establishing the connection to the destination.
NEW QUESTION # 58
After the factory default configuration is loaded, which configuration object must be created prior to the first commit?
- A. root authentication
- B. loopback IP address
- C. host name
- D. out-of-band connectivity
Answer: A
Explanation:
In Juniper Networks devices, when the factory default configuration is loaded, the first step before committing any configuration is to set up root authentication. This is crucial because it secures the device by ensuring that only authorized users have administrative access. Without setting up a root password, the device will not allow any commit operations, which is a safety measure to prevent unauthorized access. This requirement emphasizes the importance Juniper places on security right from the initial setup of the device.
NEW QUESTION # 59
Click the Exhibit button.
Referring to the exhibit, what is the source IP address of the ping that was executed?
- A. 10.24.0.4
- B. 10.12.0.2
- C. 10.23.0.3
- D. 10.23.0.2
Answer: D
Explanation:
The exhibit shows a ping test being executed from router R2 to the IP address 10.23.0.3. Since the ping command is issued on R2 and we see successful replies from 10.23.0.3, it means the source of the ping must be an interface on R2. Given the network diagram and the IP address scheme, the source IP address of the ping is on the interface ge-0/0/2 of R2, which is in the subnet 10.23.0.0/24. The only logical IP address for R2's interface in this subnet, based on standard networking practices and the given options, would be 10.23.0.2. The other addresses provided in the options belong to different subnets or are the destination of the ping itself.
NEW QUESTION # 60
Which two addresses are included in an Ethernet frame header? (Choose two.)
- A. source IP address
- B. destination MAC address
- C. source MAC address
- D. destination IP address
Answer: B,C
Explanation:
An Ethernet frame header includes the source MAC address (B) and the destination MAC address (D). These addresses are used to deliver the frame from one Ethernet device to another directly connected Ethernet device on the same network segment. Ethernet frames do not include IP addresses, as those are part of the IP packet encapsulated within the Ethernet frame.
NEW QUESTION # 61
Which two statements describe the result when you enter? at the command-line prompt? (Choose two.)
- A. It lists tips for the help menu.
- B. It displays help about a text string contained in a statement.
- C. It lists the available commands and options.
- D. It displays summary information about the commands and options.
Answer: C,D
Explanation:
When you enter ? at the command-line prompt in Junos OS, the system provides assistance in two significant ways. Firstly, it lists the available commands and options that can be used at the current point in the command hierarchy, aiding users in understanding what commands they can execute next. Secondly, it displays summary information about those commands and options, providing brief descriptions or additional context that can help users understand the function of each command or option. This feature is particularly useful for learning the command structure or for quick reference when specific command syntax is forgotten.
NEW QUESTION # 62
Which layer of the OSI model contains the IP address information?
- A. Layer 1
- B. Layer 2
- C. Layer 3
- D. Layer 4
Answer: C
Explanation:
The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions in seven distinct layers. IP (Internet Protocol) addresses are part of Layer 3, known as the Network Layer. This layer is responsible for packet forwarding, including routing through intermediate routers, and it handles the logical addressing scheme of the network to ensure that packets can be routed across multiple networks and reach their destination. IP addresses provide unique identifiers for network interfaces, allowing for communication between devices on a network or across different networks.
NEW QUESTION # 63
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters can match Layer 4 parameters.
- B. Firewall filters can match Layer 7 parameters.
- C. Firewall filters are stateless.
- D. Firewall filters are stateful.
Answer: A,C
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, Junosfirewall filters primarily operate up to Layer 4 and do not natively inspect Layer 7 parameters, which involve application-level data.
NEW QUESTION # 64
Which two components are included in a transport header? (Choose two.)
- A. destination MAC address
- B. destination port number
- C. source port number
- D. source MAC address
Answer: B,C
NEW QUESTION # 65
By default, how does the PFE manage unicast traffic destined for an existing forwarding table entry?
- A. It sends the traffic through multiple ports toward its destination.
- B. It sends the traffic through one port toward its destination.
- C. It sends all traffic to the control plane for further processing.
- D. It sends the traffic through the f xpl interface to the RE.
Answer: B
Explanation:
In a Juniper Networks device, the Packet Forwarding Engine (PFE) processes unicast traffic by forwarding it according to the existing entries in the forwarding table. When the PFE encounters unicast traffic destined for an address that has a corresponding entry in the forwarding table, it directs the traffic through a specific outgoing interface or port toward its destination. This process is based on the most efficient path determined by the routing protocols in use, ensuring that the packet reaches its intended destination through a singular path, unless specific configurations such as load balancing are in place.
NEW QUESTION # 66
What are two examples of exception traffic? (Choose two.)
- A. log messages
- B. transit packets
- C. ping to the local device
- D. routing updates
Answer: A,D
Explanation:
Exception traffic includes traffic that is not simply forwarded by the router but requires special handling, such as routing updates (B) and log messages (C). These types of traffic are processed by the router's control plane rather than just being forwarded through the data plane.
NEW QUESTION # 67
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 routing 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 forwarding table stores all routes and prefixes from all protocols.
Answer: B,C
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 # 68
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 # 69
Which two statements are correct about firewall filters? (Choose two.)
- A. There can be only one firewall filter.
- B. "Accept" is the default action of packets that are not explicitly allowed.
- C. "Discard" is the default action of packets that are not explicitly allowed.
- D. There can be multiple firewall filters.
Answer: C,D
Explanation:
In Juniper Networks devices, firewall filters are used to control packet flow through the device. The default action for packets that do not match any of the specified criteria in the firewall filter is to discard them, enhancing network security by ensuring that only explicitly allowed traffic can pass through. Furthermore, it is possible to configure multiple firewall filters on a device, allowing for granular control over traffic based on various criteria such as source, destination, and protocol type.
NEW QUESTION # 70
What are two benefits when implementing class of service? (Choose two.)
- A. Traffic congestion will be eliminated.
- B. Latency-sensitive traffic can be prioritized
- C. Traffic congestion can be managed.
- D. The network will be faster.
Answer: A,B
Explanation:
Implementing Class of Service (CoS) in a network provides numerous benefits, particularly in managing traffic based on its importance, source, or type. CoS enables network administrators to manage traffic congestion by applying various queuing techniques and policies to ensure that critical services remain unaffected during high congestion periods. Additionally, CoS allows for the prioritization of latency-sensitive traffic such as voice and video, ensuring that these services maintain quality despite varying network conditions.
NEW QUESTION # 71
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Juniper JN0-105 Exam Syllabus Topics:
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