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Guide for 4A0-105: Nokia Virtual Private LAN Services

Quiz 4A0-105: Nokia Virtual Private LAN Services

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Quiz

1/10
Service Fundamentals Review
An engineer reviewing Ethernet fundamentals asks why an Ethernet frame carrying only a 20-byte payload is transmitted as a 64-byte frame on the wire. What is the reason for the 64-byte minimum frame size in Ethernet?
Select the answer
1 correct answer
A.
The minimum size guarantees that the frame check sequence has enough data to compute a valid CRC-32 value.
B.
The minimum size is required so that the destination MAC address is always aligned on a 32-bit boundary.
C.
The minimum size ensures that a transmitting station can detect a collision before it finishes sending the frame in classic CSMA/CD networks.
D.
The minimum size prevents small frames from being discarded by store-and-forward switches that require full buffers.

Quiz

2/10
Introduction to VPLS
Which of the following best describes a Virtual Private LAN Service (VPLS) as implemented on the Nokia 7750 SR?
Select the answer
1 correct answer
A.
A Layer 3 VPN service in which the provider edge routers exchange customer routes and forward traffic based on IP lookups
B.
A multipoint-to-multipoint Layer 2 service that emulates an Ethernet LAN, allowing geographically dispersed customer sites to appear on the same broadcast domain across an IP/MPLS core
C.
A point-to-point Ethernet service that transparently connects exactly two customer sites over a single pseudowire
D.
A routed service in which each customer access interface is placed directly into the provider's global routing table

Quiz

3/10
VPLS Features
An operator runs three VPLS services (IDs 100, 200, and 300) on a Nokia 7750 SR. MAC address 00:AA:BB:CC:DD:01 has been dynamically learned in service 100. A frame then arrives on a SAP in service 200 destined to 00:AA:BB:CC:DD:01, which has never been seen in service 200. How does the router handle this frame?
Select the answer
1 correct answer
A.
It forwards the frame using the FDB entry that exists in service 100
B.
It drops the frame because the MAC address is already owned by another service
C.
It floods the frame to all endpoints in service 200 because each VPLS maintains its own independent FDB
D.
It sends the frame to the CPM for centralized MAC resolution across all services

Quiz

4/10
VPLS Loop Avoidance
A customer connects its CE switch to two different 7750 SR PEs participating in the same VPLS to improve resiliency. Shortly after the second link is activated, the customer reports a broadcast storm. What is the fundamental reason this dual-homing arrangement creates a forwarding loop?
Select the answer
1 correct answer
A.
The second PE advertises a duplicate pseudowire label, causing the ingress PE to replicate every frame twice into the full mesh.
B.
Dual-homing forces both PEs to become root bridges simultaneously, so neither PE blocks its access port.
C.
The CE, the two SAPs, and the VPLS full mesh together form a closed physical path, and a VPLS floods unknown, broadcast, and multicast traffic on all eligible objects, so frames circulate endlessly around that path.
D.
The two PEs synchronize their FDBs over the mesh, which causes each learned MAC address to be installed twice and triggers continuous relearning.

Quiz

5/10
VPLS Redundancy Techniques
An engineer configures a LAG between a CE switch and a Nokia 7750 SR to carry a VPLS SAP. Both devices are configured with LACP in passive mode. The physical ports are up, but the LAG never becomes operational for aggregation. What is the most likely cause?
Select the answer
1 correct answer
A.
Passive mode requires port-threshold to be configured before the LAG can form
B.
LACP passive mode is only supported on network ports, not access ports
C.
Neither device initiates LACPDU transmission, so no LACP exchange ever starts
D.
Passive mode disables the LAG hashing function, keeping the LAG down

Quiz

6/10
Large Scale VPLS Deployments
A service provider deploys a flat VPLS service across 10 PE routers on Nokia 7750 SRs, with a full mesh of pseudowires between all participating PEs. How many pseudowires are required for this single VPLS service?
Select the answer
1 correct answer
A.
90
B.
45
C.
100
D.
55

Quiz

7/10
VPLS Verification and Troubleshooting
An engineer configures VPLS 100 on a Nokia 7750 SR and issues "show service id 100 base". The output shows Admin State: Up but Oper State: Down. The service has two SAPs and one mesh SDP binding configured. Which condition explains the service being operationally down?
Select the answer
1 correct answer
A.
The service-mtu was changed from its default value, which forces the service down until all bindings re-signal
B.
All SAPs and all SDP bindings in the service are operationally down
C.
A multipoint service requires at least two SAPs to be operationally up before it transitions to up
D.
The mesh SDP binding references an SDP that is administratively down, which always forces the entire service down

Quiz

8/10
Service Fundamentals Review
A network operator plans a large Layer 2 deployment using IEEE 802.1Q tagging on a single switched domain. Considering the structure of the 802.1Q VLAN tag, how many VLAN IDs are actually usable for assigning customer traffic?
Select the answer
1 correct answer
A.
4096, because the VLAN ID field is 12 bits long
B.
4094, because VLAN IDs 0 and 4095 are reserved
C.
4095, because only VLAN ID 0 is reserved
D.
1024, because 2 bits of the field are used for priority marking

Quiz

9/10
Introduction to VPLS
An enterprise has five branch offices and requires any-to-any Layer 2 connectivity so that all sites share a single broadcast domain and can run their own routing protocol transparently across the provider network. Which Nokia SR OS service type best meets this requirement?
Select the answer
1 correct answer
A.
Epipe, because it provides transparent Ethernet transport between sites
B.
VPRN, because it supports any-to-any connectivity between all customer sites
C.
VPLS, because it provides multipoint Layer 2 connectivity and emulates a single LAN across all five sites
D.
IES, because it gives each site a routed interface into the provider network

Quiz

10/10
VPLS Features
Which event causes a Nokia 7750 SR to install a new dynamic MAC entry in the FDB of a VPLS service against a particular SAP?
Select the answer
1 correct answer
A.
A frame arrives on the SAP and its source MAC address is not yet present in the service FDB
B.
A frame arrives on the SAP with a destination MAC address that is not yet in the service FDB
C.
The control plane processes an ARP reply received on the SAP
D.
The far-end PE advertises the MAC address through targeted LDP
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  • Quiz name:4A0-105: Nokia Virtual Private LAN Services
  • Total number of questions:448
  • Number of questions for the test:50
  • Pass score:80%

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