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| Section | Objectives |
|---|---|
| User Interfaces and Configuration Basics | - CLI and Basic Configuration
|
| Routing Fundamentals | - Routing Concepts and Configuration
|
| Junos OS Fundamentals | - Junos Architecture and Operations
|
| Networking Fundamentals | - Core Networking Concepts
|
| Operational Monitoring and Maintenance | - Monitoring and Troubleshooting
|
| Routing Policy and Firewall Filters | - Policy Control and Packet Filtering
|
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NEW QUESTION # 60
Which two statements are correct about logical units? (Choose two.)
Answer: A,B
Explanation:
A single physical interface can be divided into multiple logical units to support different configurations. Logical units can also have multiple IP addresses assigned under the same unit.
NEW QUESTION # 61
Click the Exhibit button.
The MX204 has 12 built-in ports.
Referring to the exhibit, to which interface does the arrow point?
Answer: C
Explanation:
The Juniper MX204 is a fixed-configuration router that utilizes a specific hierarchical naming convention for its physical interfaces: type-fpc/pic/port. In the MX204 architecture, there is a single built-in Flexible PIC Concentrator (FPC), which is always designated as FPC 0. This FPC is subdivided into two logical Physical Interface Cards (PICs): PIC 0 and PIC 1.
As shown in the exhibit, PIC 0 contains four high-speed ports (labeled 0/0 through 0/3) that typically support 40GbE or 100GbE speeds. PIC 1 contains eight ports (labeled 1/0 through 1/7) designed for 1GbE or 10GbE connectivity. These ports are arranged in a stacked, $2 \times
4$ grid. The labeling system on the chassis indicates the port numbers for each column. In the fourth column of the PIC 1 block, the top port is identified as 1/6 and the bottom port as 1/7.
The blue arrow in the exhibit points directly to the bottom-right interface in the PIC 1 section.
Correlating this physical location with the chassis labels confirms that the port number is 7. When combined with the FPC and PIC identifiers, the full interface name is xe-0/1/7 (assuming a 10GbE transceiver is installed). Understanding this physical-to-logical mapping is essential for accurate cabling and configuration within the Junos OS, ensuring that administrators apply the correct logical unit and protocol settings to the intended physical hardware.
NEW QUESTION # 62
Referring to the exhibit, with firewall filter Packet-Filter attached to an interface, if traffic is sent from 192.168.1.1 to 8.8.8.8 for a UDP DNS query, what will happen to the traffic?
Answer: C
Explanation:
Junos OS firewall filters operate on a first-match basis, evaluating terms sequentially from top to bottom. In this scenario, a UDP DNS packet (destination port 53) is sent from 192.168.1.1 to
8.8.8.8. Evaluation begins with term 1, which matches the correct source and destination IP addresses but specifies protocol tcp. Because the actual traffic uses UDP, term 1 is not a match.
Evaluation then moves to term 2. While term 2 correctly identifies protocol udp and port domain (port 53), it requires the source-address to reside within the 192.168.2.0/24 subnet. Since the source is 192.168.1.1, term 2 also fails to match.
When a packet fails to match any explicitly defined terms in a Junos firewall filter, it is subject to the implicit deny action. This default "last term" is a hardcoded safety mechanism that automatically discards all traffic that has not been explicitly permitted. Consequently, because neither term provides a match for the specific combination of source IP, protocol, and destination port, the DNS query is silently dropped by the Packet Forwarding Engine. This behavior ensures that Junos devices maintain a "deny-by-default" security posture, requiring administrators to define precise permit statements for all required transit or management traffic.
NEW QUESTION # 63
Exhibit:
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
Answer: C
Explanation:
The network topology illustrates two distinct IP subnets, 10.1.1.0/24 and 10.1.2.0/24 , separated by a Layer 3 router. For hosts on the first subnet to communicate with the server on the second subnet, an intermediary device must perform inter-subnet routing. The router acts as the exit point for each local segment, utilizing its interfaces assigned with the .254 host address as the logical path to external networks.
The fundamental requirement for this communication is the configuration of a default gateway on all end- nodes. When the users (on 10.1.1.0/24 ) attempt to send data to the server (on 10.1.2.0/24 ), their local TCP/IP stack recognizes the destination is not on the local wire. Without a defined default gateway, the hosts would simply drop the traffic as unroutable. By setting the default gateway to 10.1.1.254 for users and 10.1.2.254 for the server, the hosts are instructed to forward all off-net traffic to the router. The router then consults its routing table-which contains these directly connected routes-and forwards the packets to the appropriate egress interface. While VLAN tagging or routing protocols could exist in more complex environments, the primary necessity for basic reachability between these two specific segments is a correctly configured gateway on the terminal devices. Reference: Networking Fundamentals, IP Routing Basics, Default Gateway Configuration.
NEW QUESTION # 64
What are two requirements for root password recovery in Junos? (Choose two.)
Answer: A,B
Explanation:
Root password recovery in Junos OS is a critical administrative procedure designed to regain access to the management plane when the root credentials are lost. This process is fundamentally tied to the physical security of the device, as it requires two specific conditions that cannot be met over a standard network connection. First, the administrator must have direct console access to the device. Because the recovery process involves interrupting the Junos boot sequence before the operating system kernel and its associated security services (such as SSH) are fully initialized, it must be performed through the serial management port.
Second, a system reboot is mandatory. The recovery mechanism is triggered by interrupting the boot loader (typically the " Loader " or " U-Boot " stage) by pressing the Space bar or a specific key sequence during power-on. This allows the administrator to enter " single-user mode " or boot into a " recovery " state. Once in this restricted environment, the device mounts its internal storage in a way that permits the modification of the root authentication parameters without requiring the existing password. This workflow intentionally bypasses the standard authentication database to restore management control while preserving the rest of the device configuration. This procedure underscores the importance of securing physical access to the chassis, as anyone with console access and the ability to cycle power can eventually gain root-level authority over the system.
Reference: Operational Monitoring and Maintenance, System Recovery and Password Management.
NEW QUESTION # 65
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