ETCP IP and Transport Networks 2 — Questions and Answers
Question 1: Which technology does Ericsson use for network synchronization in transport networks to support LTE/5G timing requirements?
- NTP
- PTP (IEEE 1588) (Correct answer)
- SNTP
- TRILL
Correct answer: PTP (IEEE 1588)
PTP (Precision Time Protocol, IEEE 1588) provides the sub-microsecond synchronization accuracy required by LTE and 5G base stations.
Question 2: What is the function of RSVP-TE in Ericsson MPLS networks?
- Provides dynamic host configuration
- Signals and reserves resources for traffic-engineered LSPs (Correct answer)
- Manages subscriber authentication
- Monitors link utilization
Correct answer: Signals and reserves resources for traffic-engineered LSPs
RSVP-TE (Resource Reservation Protocol - Traffic Engineering) signals LSP setup and reserves bandwidth resources along the path.
Question 3: In Ericsson IP transport, what is a VRF used for?
- Creating separate virtual routing tables for different customers or services (Correct answer)
- Encrypting inter-node traffic
- Managing physical port configurations
- Measuring packet loss on a link
Correct answer: Creating separate virtual routing tables for different customers or services
A VRF (Virtual Routing and Forwarding) instance creates an isolated routing table, allowing multiple customers or services to share the same physical infrastructure.
Question 4: Which Ericsson product line is used to provide microwave backhaul connectivity for mobile sites?
- Ericsson MINI-LINK (Correct answer)
- Ericsson RBS 6000
- Ericsson Smart Services Router
- Ericsson MSC-S
Correct answer: Ericsson MINI-LINK
Ericsson MINI-LINK is the portfolio of microwave backhaul solutions used to connect base stations to the core transport network.
Question 5: What does the term 'Fast Reroute (FRR)' mean in Ericsson MPLS transport?
- A method to quickly switch to a pre-computed backup path when a failure is detected (Correct answer)
- A protocol for rapid BGP convergence
- A technique for accelerating packet queuing
- A hardware mechanism for forwarding at line rate
Correct answer: A method to quickly switch to a pre-computed backup path when a failure is detected
MPLS Fast Reroute provides sub-50ms failure recovery by switching to a pre-established backup LSP upon detecting a link or node failure.
Question 6: Which encapsulation is used in Ericsson's Carrier Ethernet services to transport Layer 2 frames over an MPLS core?
- GRE
- VXLAN
- Pseudowire (PWE3) (Correct answer)
- IPsec tunnel
Correct answer: Pseudowire (PWE3)
Pseudowire (PWE3) encapsulates Layer 2 frames inside MPLS labels to transport Ethernet, ATM, or TDM services over an IP/MPLS backbone.
ETCP IP and Transport Networks 2
Which technology does Ericsson use for network synchronization in transport networks to support LTE/5G timing requirements?