Latest [Dec 07, 2025] JN0-105 Exam Questions – Valid JN0-105 Dumps Pdf
JN0-105 Practice Test Questions Answers Updated 102 Questions
Juniper JN0-105 Exam Syllabus Topics:
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NEW QUESTION # 46
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters can match Layer 7 parameters.
- B. Firewall filters are stateful.
- C. Firewall filters can match Layer 4 parameters.
- D. Firewall filters are stateless.
Answer: C,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, Junosfirewall filters primarily operate up to Layer 4 and do not natively inspect Layer 7 parameters, which involve application-level data.
NEW QUESTION # 47
Which character is used to filter the command output in the Junos CLI?
- A. ?
- B. <
- C. |
- D. >
Answer: C
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 # 48
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
- A. Switches create a single collision domain.
- B. Switches are susceptible to traffic loops.
- C. Switches do not learn MAC addresses.
- D. Switches flood broadcast traffic.
Answer: B,D
Explanation:
Layer 2 network switches are crucial components in local area networks (LANs), providing multiple functions for data packet forwarding and network segmentation. One inherent characteristic of switches is their susceptibility to traffic loops, especially in networks with redundant paths. Without proper loop prevention protocols like Spanning Tree Protocol (STP), loops can cause broadcast storms and network instability. Additionally, switches inherently flood broadcast traffic to all ports within the broadcast domain, except the port on which the broadcast was received. This is because broadcast frames are meant to be delivered to all devices within the VLAN, and the switch ensures this by flooding these frames to all ports in the VLAN, except the source port.
NEW QUESTION # 49
Exhibit
policy-options { policy-statement Load-Balance-Policy { term Load-Balance { then { load-balance per-flow; accept;
}
}
}
}
routing-options {
router-id 192.168.100.11; autonomous-system 65201; forwarding-table {
export Load-Balance-Policy;
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The policy enables per-packet load balancing.
- B. The policy must be applied under the protocols hierarchy.
- C. The policy enables flow-based load balancing.
- D. The policy enables equal cost load balancing in the forwarding table.
Answer: C,D
Explanation:
The load-balance per-flow statement in the Junos OS policy-options configuration enables flow-based load balancing in the forwarding table. This means that the traffic is distributed across multiple paths based on flows, where a flow is typically identified by attributes such as source and destination IP addresses, and possibly layer 4 information like TCP/UDP ports. This allows for more granular and efficient utilization of available paths, avoiding overloading a single path. The policy does not enable per-packet load balancing, which would send individual packets of the same flow over different paths, potentially causing out-of-order delivery issues. The policy's placement in the forwarding-table export suggests it's intended to influence forwarding behavior, not just routing protocol decisions, and does not necessarily have to be applied under the protocols hierarchy.
NEW QUESTION # 50
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. Thestaticrouteisrejected by the default routing policy.
- B. Thestaticrouteisevaluated by the poiicy2 routing policy.
- C. Thestaticrouteisrejected by the policyl routing policy.
- D. Thestaticrouteisevaluated by the poiicy3 routing policy.
Answer: B
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 # 51
Which prompt indicates that you are using configuration mode?
- A. #
- B. $
- C. >
- D. %
Answer: A
Explanation:
In Junos OS, the # prompt indicates that you are in configuration mode. This mode is used for making changes to the configuration of the device.
NEW QUESTION # 52
Exhibit
[edit]
user@routerl set interfaces ge-0/1/2 unit 0 family inet address 172.16.101.1/24 [edit] user@router# commit check configuration check succeeds
[edit]
user@router#
You need to configure interface ge-0/1/2 with an IP address of 172.16.100.1/24. You have accidentally entered 172.16.101.1/24 as shown in the exhibit.
Which command should you issue to solve the problem?
- A. (edit] user@router# rollback 1
- B. [edit] userOrouter# rollback 0
- C. [edit] user@router# rollback 2
- D. [edit] user@routeri rollback rescue
Answer: A
Explanation:
If you've committed a configuration and then need to revert to the previous configuration, the rollback command is used. Since the incorrect IP address has not been committed, as indicated by the commit check command being successful, issuing rollback 1 will undo the changes made in the current session, which includes the accidental entry of the IP address.
NEW QUESTION # 53
Exhibit
{hold:node0}[edit]
root# set system root-authentication ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups encrypted-password Encrypted password string load-key-file File (URL) containing one or more ssh keys plain-text-password Prompt for plain text password (autoencrypted)
> ssh-dsa Secure shell (ssh) DSA public key string
> ssh-rsa Secure shell (ssh) RSA public key string
{hold:node0}[edit]
root# set system root-authentication plain-text-password
New password:
Retype new password:
{hold:node0}[edit]
root# commit and-quit
[edit interfaces]
'ge-0/0/0'
HA management port cannot be configured
error: configuration check-out failed
{hold:node0}[edit]
root#
You are unable to remotely access your Juniper device using the CLI.
Referring to the exhibit, which command would you add to the existing configuration to enable remote CLI access?
- A. set system root-authentication plain-text-password
- B. set system services ssh
- C. load factory-default
- D. set system login idle-timeout 20
Answer: B
Explanation:
In Junos OS, remote access to the device's CLI is commonly facilitated through Secure Shell (SSH), a protocol providing secure command-line access over an insecure network. The given exhibit indicates an attempt to set a root authentication password but does not show configuration for enabling remote access services. To enable SSH, which is not shown in the configuration snippet, you need to configure the device to accept SSH connections. This is done by enabling the SSH service within the system services hierarchy of the configuration. The correct command to add to the existing configuration for enabling remote CLI access via SSH isset system services ssh. This command activates the SSH service, allowing secure remote logins to the device.
NEW QUESTION # 54
Which two common routing policy actions affect the flow of policy evaluation? (Choose two.)
- A. next policy
- B. next hop
- C. community
- D. next term
Answer: A,D
Explanation:
In Junos OS routing policy evaluation, "next policy" (A) and "next term" (C) are common actions that affect the flow of policy evaluation. "Next policy" directs the evaluation to the next policy in the sequence, whereas
"next term" moves the evaluation to the next term within the current policy, allowing for granular control over routing decisions.
NEW QUESTION # 55
Which two statements are true about the Junos OS? (Choose two.)
- A. Exception traffic is sent to the control plane.
- B. Exception traffic is never sent to the control plane.
- C. Routing tables are stored in the forwarding plane.
- D. Routing tables are stored in the control plane.
Answer: A,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 # 56
You need to recover the root password on a Junos router without losing the current configuration settings.
Which three statements describe what you should perform in this scenario? (Choose three.)
- A. Upgrade the Junos OS to the latest version.
- B. Load the factory-default configuration.
- C. Hit the space bar and enter recovery when prompted.
- D. Use a console connection to reboot the device.
- E. Enter and commit the new root password.
Answer: C,D,E
Explanation:
To recover the root password on a Junos router without losing the configuration, you should (A) enter and commit the new root password once you have gained access to the system, (D) hit the space bar to interrupt the boot process and enter recovery mode when prompted during the boot process, and (E) use a console connection to reboot the device and access the bootloader prompt. These steps allow you to reset the root password while preserving the existing configuration.
NEW QUESTION # 57
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. The OSPF path is the only active route.
- D. / Traffic is load-balanced across two routes.
Answer: C
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's decision process, which takes into account factors such as route preference (administrative distance) and metrics.
NEW QUESTION # 58
Which type of device uses the destination IP address to forward packets?
- A. Layer 2 switch
- B. Layer 3 router
- C. repeater
- D. hub
Answer: B
Explanation:
A Layer 3 router forwards packets based on the destination IP address. It operates at the network layer of the OSI model and uses routing tables to determine the best path for packet delivery. Unlike Layer 2 switches, which forward packets based on MAC addresses, routers handle logical addressing, making them crucial for inter-network communication.
Reference:
Junos OS Documentation on Routing Fundamentals.
NEW QUESTION # 59
You are asked to configure your device running Junos OS to automatically archive your configuration upon commit In this scenario, which two methods are supported by the Junos OS? (Choose two)
- A. RCP
- B. HTTP
- C. SCP
- D. FTP
Answer: A,C
Explanation:
Junos OS supports multiple methods for automatically archiving configurations upon commit. Two of the supported methods are SCP (Secure Copy Protocol) and RCP (Remote Copy Protocol). These methods can be configured to save the configuration files to a remote server automatically whenever a commit is made.
Reference:
"You can configure Junos OS to automatically archive the configuration using protocols such as SCP and RCP upon commit."
NEW QUESTION # 60
What are two link-state routing protocols? (Choose two.)
- A. OSPF
- B. RIP
- C. BGP
- D. IS-IS
Answer: A,D
Explanation:
Link-state routing protocols are a type of routing protocol used in packet-switching networks for finding the best path between source and destination. OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are both examples of link-state routing protocols. They work by maintaining a complete map or topology of the network, allowing routers to independently calculate the best path to each destination.
Unlike distance-vector protocols like RIP, link-state protocols are more efficient and scalable, making them suitable for larger networks.
NEW QUESTION # 61
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It provides access to the CLI.
- B. It creates forwarding tables.
- C. It maintains routing tables.
- D. It generates chassis alarms.
Answer: B,C
Explanation:
The Routing Protocol Daemon (rpd) is a critical component in Juniper Networks devices, responsible for all routing operations. It maintains routing tables, which hold information about network paths and destinations derived from various routing protocols. These tables are used to make decisions about where to send packets.
Additionally, rpd generates forwarding tables based on the information in the routing tables. The forwarding tables are then used by the Packet Forwarding Engine (PFE) to actually forward packets to their next hop or final destination.
NEW QUESTION # 62
By default, how does the PFE manage unicast traffic destined for an existing forwarding table entry?
- A. It sends the traffic through the f xpl interface to the RE.
- B. It sends the traffic through one port toward its destination.
- C. It sends the traffic through multiple ports toward its destination.
- D. It sends all traffic to the control plane for further processing.
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 # 63
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