NRS-1 Practice Test
1 Which of the following is TRUE about a CE router that is
involved in a VPN service?
a. It is aware of the VPN services provided by the service
provider.
b. It resides on the service provider premises.
c. It connects to at least one PE router.
d. It connects to at least one CE router. - ✔ ✔ c. It connects to at
least one PE router.
2 What is the function of a SAP?
a. It provides a P device with service access.
b. It provides a CE device with service access.
c. It binds the service to an MPLS service tunnel.
d. It binds the service to an MPLS transport tunnel. - ✔ ✔ b. It
provides a CE device with service access.
3 Which of the following about the service label is FALSE?
a. The ingress PE device encapsulates customer data
with a service label.
b. A service label identifies the service that data
,belongs to.
c. The egress PE device strips the service labels and
forwards unlabeled packets.
d. A P device performs a service label swap operation. - ✔ ✔ d. A P
device performs a service label swap operation.
4 Which device adds MPLS labels to packets that enter
a service provider network?
a. CE
b. P
c. iLER
d. eLER - ✔ ✔ c. iLER
5 Which device is the termination point of a Label Switched
Path (LSP)?
a. CE
b. P
c. iLER
d. eLER - ✔ ✔ d. eLER
6 What operation is performed by an iLER when it receives
a packet?
a. It pushes a new MPLS label and forwards the packet
, to the next LSR.
b. It swaps the MPLS albel and forwards the packet to
the next LSR.
c. It forwards the packet to the next LSR without altering
the MPLS label.
d. It pops the MPLS label and forwards the packet to
the next IP router. - ✔ ✔ a. It pushes a new MPLS label and
forwards the packet
to the next LSR.
7 Which of the following devices performs a label swap
operation?
a. LSR
b. iLER
c. eLER
d. CE - ✔ ✔ a. LSR
8 Which of the following about VPWS is FALSE?
a. VPWS is a Layer 2 service.
b. VPWS emulates a single leased line between two
locations.
c. Each VPWS maintains a MAC FDB.
1 Which of the following is TRUE about a CE router that is
involved in a VPN service?
a. It is aware of the VPN services provided by the service
provider.
b. It resides on the service provider premises.
c. It connects to at least one PE router.
d. It connects to at least one CE router. - ✔ ✔ c. It connects to at
least one PE router.
2 What is the function of a SAP?
a. It provides a P device with service access.
b. It provides a CE device with service access.
c. It binds the service to an MPLS service tunnel.
d. It binds the service to an MPLS transport tunnel. - ✔ ✔ b. It
provides a CE device with service access.
3 Which of the following about the service label is FALSE?
a. The ingress PE device encapsulates customer data
with a service label.
b. A service label identifies the service that data
,belongs to.
c. The egress PE device strips the service labels and
forwards unlabeled packets.
d. A P device performs a service label swap operation. - ✔ ✔ d. A P
device performs a service label swap operation.
4 Which device adds MPLS labels to packets that enter
a service provider network?
a. CE
b. P
c. iLER
d. eLER - ✔ ✔ c. iLER
5 Which device is the termination point of a Label Switched
Path (LSP)?
a. CE
b. P
c. iLER
d. eLER - ✔ ✔ d. eLER
6 What operation is performed by an iLER when it receives
a packet?
a. It pushes a new MPLS label and forwards the packet
, to the next LSR.
b. It swaps the MPLS albel and forwards the packet to
the next LSR.
c. It forwards the packet to the next LSR without altering
the MPLS label.
d. It pops the MPLS label and forwards the packet to
the next IP router. - ✔ ✔ a. It pushes a new MPLS label and
forwards the packet
to the next LSR.
7 Which of the following devices performs a label swap
operation?
a. LSR
b. iLER
c. eLER
d. CE - ✔ ✔ a. LSR
8 Which of the following about VPWS is FALSE?
a. VPWS is a Layer 2 service.
b. VPWS emulates a single leased line between two
locations.
c. Each VPWS maintains a MAC FDB.
