Free Nokia 4A0-100 Exam Practice Questions & Explanations
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What is the purpose of a broadcast IP address?
A broadcast IP address is used to send a message to all devices on a specific IP subnet. This address is the highest address in the subnet (i.e., all host bits set to 1).
Example: In 192.168.1.0/24 broadcast is 192.168.1.255.
It is used for purposes like ARP requests or DHCP discovery.
Option A is correct -- refers to all hosts in a subnet.
Option B refers to multicast, not broadcast.
Option C might refer to anycast, which is different.
Option D describes a unicast address.
Nokia IP Fundamentals Study Guide -- Chapter: 'IP Addressing and Broadcast Communication'
RFC 919 -- Broadcasting Internet Datagrams
Which of the MPLS routers is responsible for pushing new labels for LSP A and LSP B?
Nokia MPLS Fundamentals Guide -- Chapter: ''Label Operations (Push, Swap, Pop)''
Nokia SRA Study Guide -- Ingress/Egress LER roles in MPLS
Which of the following statements about the VPWS service on a Nokia 7750 SR is FALSE?
VPWS (Virtual Private Wire Service) on Nokia 7750 SR:
Emulates a Layer 2 point-to-point connection.
Does not require MAC learning, unlike VPLS.
Uses MPLS encapsulation, not IP datagrams for transport.
Option D is FALSE -- VPWS uses MPLS labels, not IP encapsulation.
Nokia 7750 SR Service Router Guide -- VPWS Overview
Nokia SRA Study Guide -- Chapter: Layer 2 Services
On the Nokia 7750 SR, which key displays all command options and their descriptions?
Comprehensive and Detailed Explanation From Exact Extract:
In the Nokia SR OS CLI, specifically in both classic CLI and MD-CLI, the '?' key is used to display a list of all possible command options at a given point in the CLI, along with a brief description of each option.
This functionality helps the user in command discovery and reduces the chances of syntactical errors by showing only valid options.
The 'Tab' key, while helpful, is primarily used for auto-completion and not for displaying detailed descriptions.
'Space bar' is used for command continuation, and 'Return' executes the command or moves to the next line.
Correct usage example in classic CLI:
*A:SR1>config>router>interface# ?
- Shows all the valid commands and parameters under interface
Nokia SRA Study Guide -- Chapter: 'CLI Fundamentals'
Nokia SR OS Fundamentals Guide -- Section: 'Using the CLI Help System'
In an MPLS network, which device is responsible for taking an unlabeled packet and encapsulating it with an MPLS label?
The Ingress Label Edge Router (LER) is the first router that:
Receives an unlabeled IP packet.
Applies an MPLS label based on its forwarding decision.
Forwards it into the MPLS core.
Option A is correct -- Ingress LER does MPLS label push.
Option B (Egress LER) -- removes labels at the end of the path.
Option C (LSR) -- switches labels, but doesn't push them onto unlabeled packets.
Option D -- is not a specific MPLS role.
Nokia IP/MPLS Fundamentals Guide -- Label Operations
RFC 3031 -- MPLS Architecture