Done LISP Flashcards
Which LISP device is responsible for publishing EID-to-RLOC mappings for a site?
A. ETR
B. MR
C. ITR
D. MS
A. ETR
Egress Tunnel Router (ETR) connects a site to the LISP-capable part of a core network (such as the Internet), publishes EID-to-RLOC mappings for the site, responds to Map-Request messages, and
decapsulates and delivers LISP-encapsulated user data to end systems at the site.
Which LISP component is required for a LISP site to communicate with a non-LISP site?
A. Proxy ITR
B. ITR
C. ETR
D. Proxy ETR
D. Proxy ETR
Proxy ETR (PETR): A PETR is a LISP Infrastructure device that allows EIDs at LISP sites to successfully communicate with devices located at non-LISP sites
“ To establish communication between LISP and non LISP sites an extra components must be use, a proxy ingress tunnel router (PITR), which allows non-LISP sits to send packet toward LISP sites. The PITR attracts traffic from non-LISP sites by advertising aggregate prefixes for the LISP EID into the non-LISP network. When PITR receives packets from non-LISP sites it encapsulate and forward these packets to LISP sites. The second element to establish communication between the LISP and non-LISP sites is called a proxy egress tunnel router (PETR). The PETR allows the communication from the LISP sites to the non-LISP sites. The PETR receives LISP encapsulated traffic from ITR. The PITR and PETR can be combine and deployed on the same node called (PxTR) to provide symmetric traffic when stateful inspection devices are deployed between LISP and non-LISP sites.”
Which device, in a LISP routing architecture, receives and de-encapsulates LISP traffic for endpoints within a LISP-capable site?
A. MR
B. ETR
C. MS
D. ITR
B. ETR
Which LISP infrastructure device provides connectivity between non-LISP sites and LISP sites by receiving non-LISP traffic with a LISP site destination?
A. PITR
B. map resolver
C. map server
D. PETR
A. PITR
PITR (Proxy Ingress Tunnel Router)
“A PITR is a LISP Infrastructure device that provides connectivity between non-LISP sites and LISP sites by attracting non-LISP traffic destined to LISP sites and encapsulating this traffic to ETRs devices deployed at LISP sites. “
Which device is responsible for finding EID-to-RLOC mapping when traffic is sent to a LISP-capable site?
A. map resolver
B. egress tunnel router
C. map server
D. ingress tunnel router
D. ingress tunnel router
An ITR is responsible for finding EID-to-RLOC mappings for all traffic destined for LISP-capable sites.
When the ITR receives a packet destined for an EID, it first looks for the EID in its mapping cache. If the ITR
finds a match, it encapsulates the packet inside a LISP header with one of its RLOCs as the IP source address
and one of the RLOCs from the mapping cache entry as the IP destination. The ITR then routes the packet
normally.
DRAG DROP
LISP MAP RESOLVER
accept LISP encapsulated map request
LISP MAP SERVER
learns of EID prefix mapping entries from an ETR
LISP Proxy ETR
receives traffic from LISP sites and sends it to non-LISP sites
LISP ITR
receives packets from site facing interfaces
Which LISP component decapsulates messages and forwards them to the map server responsible for the egress tunnel routers?
A. Router Locator
B. Map Resolver
C. Proxy ETR
D. Ingress Tunnel Router
B. Map Resolver
The function of the LISP MR is to accept encapsulated Map-Request messages from ingress tunnel routers (ITRs), decapsulate those messages, and then forward the messages to the MS responsible for the egress tunnel routers (ETRs) that are authoritative for the requested EIDs.
LISP
DRAG DROP -
Drag and drop the LISP components on the left to the correct description on the right.
Select and Place:
Map Server
- network infrastructure component that learns of EID-prefix mapping entries from an ETR
EID
- IPv4 or IPv6 address of an endpoint with a LISP site
ETR
- de-encapsulates LISP packets coming from outside of the LISP site to destinations inside of the site
What is the function of the LISP map resolver?
A. to connect a site to the LISP-capable part of a core network publish the EID-to-RLOC mappings for the site, and respond to map-request messages
B. to advertise routable non-LISP traffic from one address family to LISP sites in a different address family
C. to send traffic to non-LISP sites when connected to a service provider that does not accept nonroutable EIDs as packet sources
D. to decapsulate map-request messages from ITRs and forward the messages to the MS
D. to decapsulate map-request messages from ITRs and forward the messages to the MS
Like an MS, a LISP MR connects to the ALT. The function of the LISP MR is to accept encapsulated Map-Request messages from ingress tunnel routers (ITRs), decapsulate those messages, and then forward the messages to the MS responsible for the egress tunnel routers (ETRs) that are authoritative for the requested EIDs.
When an MR is implemented concurrently with an MS in a private mapping system deployment, the concurrent MS forwards the encapsulated Map-Request messages to the authoritative ETRs. When a LISP ALT is present in the deployment, the MR forwards the Map-Request messages directly over the ALT to the MS responsible for the ETRs that are authoritative for the requested EIDs. An MR also sends Negative Map-Replies to ITRs in response to queries for non-LISP addresses.
Which Cisco Locator/ID Separation Protocol (LISP) device receives packets from remote site facing devices and either decapsulates the LISP packets or routes them natively?
A. ITR
B. ETR
C. MS
D. MR
LISP Site Edge Devices
* ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites.
* ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
Both ETR and ITR receive packets and natively forward them, so the question’s key part is “ receives packets from remote site facing devices”. If the packets are coming from a remote site, it means they are coming from the network core. Thus, by definition, the answer is ETR.
Select the prerequisites for configuring LISP from the below options. (Choose two.)
A. Determine the type of LISP deployment you intend to deploy
B. One can directly deploy LISP without determining the type.
C. LISP configuration requires the datak9 license.
D. LISP configuration requires the advanced ip services license.
A. Determine the type of LISP deployment you intend to deploy
C. LISP configuration requires the datak9 license.
From the article below:
Before you can configure Locator/ID Separation Protocol (LISP), you will need to determine the type of LISP deployment you intend to deploy. The LISP deployment defines the necessary functionality of LISP devices, which, in turn, determines the hardware, software, and additional support from LISP mapping services and proxy services that are required to complete the deployment.
LISP configuration requires the datak9 license.
Which two namespaces does the LISP network architecture and protocol use? (Choose two.)
A. TLOC
B. RLOC
C. DNS
D. VTEP
E. EID
B. RLOC
E. EID
Locator ID Separation Protocol (LISP) is a network architecture and protocol that implements the use of two namespaces instead of a single IP address:
- Endpoint identifiers (EIDs)—assigned to end hosts.
- Routing locators (RLOCs)—assigned to devices (primarily routers) that make up the global routing system.
What it the purpose of the LISP routing and addressing architecture?
A. It creates two entries for each network node, one for its identity and another for its location on the network.
B. It allows LISP to be applied as a network virtualization overlay though encapsulation.
C. It allows multiple instances of a routing table to co-exist within the same router.
D. It creates head-end replication used to deliver broadcast and multicast frames to the entire network.
A. It creates two entries for each network node, one for its identity and another for its location on the network.
Locator ID Separation Protocol (LISP) solves this issue by separating the location and identity of a device through the Routing locator (RLOC) and Endpoint identifier (EID):
+ Endpoint identifiers (EIDs) – assigned to end hosts.
+ Routing locators (RLOCs) – assigned to devices (primarily routers) that make up the global routing system.
Which two components are supported by LISP? (Choose two.)
A. proxy ETR
B. egress tunnel router
C. route reflector
D. HMAC algorithm
E. spoke
A. proxy ETR Most
B. egress tunnel router
RLOC
IPv4 or IPv6 address of an egress tunnel router that is Internet facing or network core facing
Map Resolver
receives map-request messages from ITR and searches for the appropriate ETR by consulting mapping database
ITR
encapsulates LISP packets coming from inside of the LISP site to destinations outside of the site
Fabric Data Palne - VXLAN
Fabric Security Policy - CTS
Fabric Control Plane - LISP
External Connectivity From The Fabric - BGP
