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| Section | Objectives |
|---|---|
| Networking Fundamentals | - Routing fundamentals - OSI and TCP/IP models - IPv4/IPv6 addressing basics - Subnetting concepts |
| Routing Fundamentals in Junos | - OSPF basics - Static routing - Dynamic routing overview |
| Configuration and Monitoring | - System services and users - Interface configuration - Monitoring and troubleshooting tools |
| Security and Network Services Basics | - Firewall filters basics - NAT concepts overview |
| Junos OS Fundamentals | - Junos CLI navigation and commands - Operational vs configuration mode - Junos OS architecture - Configuration hierarchy and commit model |
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NEW QUESTION # 46
Your system administrator notified the infrastructure team that all server NICs will be moving to jumbo frames. All of the NICs used by servers are 1 gigabit. The starting frame size will be 4K. The exact frame size may change depending on testing results. In this scenario, which choice would provide a flexible solution?
Answer: D
Explanation:
In large-scale Junos deployments, efficiency and flexibility are achieved through the use of configuration groups . When faced with a requirement like moving all 1-gigabit interfaces to jumbo frames-with the caveat that the exact MTU value (e.g., 4000 bytes) might change after testing-manually editing every interface is both tedious and prone to error.
By creating a configuration group under the [edit groups] hierarchy, you can define the MTU parameter once.
You then use the apply-groups statement at the [edit interfaces] level or on specific interface ranges. This creates a " template " effect. The flexibility comes into play during the testing phase: if results indicate that a
9000-byte MTU is preferable to 4000 bytes, the architect only needs to modify the value in the group definition. The Junos OS inheritance mechanism automatically propagates this update to every interface associated with that group.
Applying MTU at the family level (Option B) is less efficient and doesn ' t handle the physical Layer 2 MTU requirements of jumbo frames as effectively. Path-MTU discovery (Option D) is a protocol-level function for avoiding fragmentation but does not configure the local interface ' s hardware capability to accept larger frames. Thus, groups represent the best practice for centralized, scalable management.
Reference: Configuration Basics, Junos Groups, Interface MTU Configuration.
NEW QUESTION # 47
You power on a new MX Series router for the first time and connect to the console. You notice that no transit interfaces are passing traffic. In this scenario, which statement is correct?
Answer: A
Explanation:
When you initially unbox and power on a Juniper MX Series router, it loads a factory-default configuration
. Unlike some consumer-grade or lower-end enterprise switches that might have all ports active in a default VLAN, high-performance routers like the MX Series prioritize security and intentionality. In the factory- default state, the transit interfaces are not configured .
While the physical hardware interfaces (such as ge-0/0/0 or xe-0/1/0) are detected by the Junos kernel, they lack any logical unit or protocol family definitions (like family inet or family inet6). Without a logical unit- even a simple unit 0-the Packet Forwarding Engine (PFE) will not accept or forward any traffic arriving on those ports. Furthermore, as discussed in previous questions, the device is essentially in a " locked " state; you cannot even commit new changes to enable these interfaces until you have defined a root-authentication password. This " blank slate " approach ensures that no traffic accidentally flows through a newly installed provider-edge device until an architect has explicitly defined the routing policies, firewall filters, and interface parameters required for the specific network environment. To begin passing traffic, you must manually define the logical units and assign the appropriate IP addresses or switching parameters to each interface.
Reference: Configuration Basics, Initial Configuration, Factory Default Settings.
NEW QUESTION # 48
Which protocol is used to discover the Layer 2 (MAC) address of a next hop for IPv6 hosts?
Answer: D
Explanation:
In the IPv6 protocol suite, the traditional Address Resolution Protocol (ARP) used in IPv4 has been deprecated and replaced by the Neighbor Discovery Protocol (NDP). NDP is a multifaceted protocol built upon the Internet Control Message Protocol version 6 (ICMPv6). Its primary purpose is to allow a host or router to determine the Layer 2 hardware (MAC) address of a neighbor on the same local link when only the neighbor's IPv6 address is known.
This specific process is known as Neighbor Solicitation and Neighbor Advertisement. When a Junos device needs to resolve a MAC address for an IPv6 next hop, it sends a Neighbor Solicitation (ICMPv6 Type 135) message to the solicited-node multicast address. The target host responds with a Neighbor Advertisement (ICMPv6 Type 136) containing its physical MAC address. Beyond address resolution, NDP also handles Router Discovery, Prefix Discovery, and Duplicate Address Detection (DAD). Unlike ARP, which relies on broadcasts that can impact all hosts on a segment, NDP utilizes efficient multicast communication. Understanding NDP is critical for Junos architects, as it is the foundational mechanism that facilitates logical-to-physical address mapping in modern IPv6 environments, ensuring that the Packet Forwarding Engine can properly encapsulate frames for local delivery.
NEW QUESTION # 49
What are two ways that the carrier-sense multiple access with collision detection (CSMA/CD) MAC protocol help devices "talk" with each other in an Ethernet network? (Choose two.)
Answer: B,C
Explanation:
CSMA/CD allows an Ethernet device to check if the network is idle (carrier sense) before attempting to transmit, reducing the chance of collisions.
With CSMA/CD, a device can either transmit or receive data at a given time (half-duplex), not both simultaneously, which helps coordinate communication and manage collisions.
NEW QUESTION # 50
What is the default route preference value for static routes in Junos OS?
Answer: D
Explanation:
Static routes have a default preference value of 5 in Junos OS, making them more preferred than most dynamic routing protocols such as OSPF (10) or BGP (170), except for directly connected routes.
NEW QUESTION # 51
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