Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
35 Cards in this Set
- Front
- Back
|
True/False: Packets inside a GRE tunnel are not encrypted?
|
True
|
|
|
True/False: Multicast packets can traverse GRE tunnels?
|
True
|
|
|
True/False: Multicast packets can traverse IPSec VPN tunnels?
|
False
|
|
|
What type of interface does GRE use?
|
Logical tunnel interface
|
|
|
What MTU should you configure your GRE tunnel for?
|
1400 bytes
|
|
|
What Maximum Segment Size (MSS) should you configure on your GRE tunnel?
|
1360 bytes
|
|
|
True/False: You need to configure both a tunnel source and destination for a GRE tunnel?
|
True
|
|
|
True/False: You use the physical interface address as the source/destination of a GRE tunnel?
|
True
|
|
|
When creating a tunnel what is the default protocol does the tunnel use?
|
GRE
|
|
|
What does the IP-IP encapsulation do?
|
Encapsulates one IP packet inside another.
|
|
|
What two ways are there to configure mGRE on the hub/spoke routers?
|
Static NHRP mapping statements and dynamic NHRP statements using EIGRP.
|
|
|
True/False: You only need to configure NHRP on the hub router when configuring mGRE?
|
True
|
|
|
What three things need to be configured in the tunnel interface on a spoke router in a mGRE configuration?
|
Tunnel source/destination and IP address
|
|
|
What combination of technologies make up Dynamic Multipoint VPN (DMVPN)?
|
Multipoint GRE (mGRE), Next Hop Resolution Protocol (NHRP), Dynamic Routing Protocols (EIGRP, RIP, OSPF, BGP), Dynamic IPSec Encryption, and Cisco Express Forwarding (CEF)
|
|
|
What is considered to be DMVPN Phase 1?
|
Hub and Spokes (mGRE hub, p2p GRE spokes)
|
|
|
What is considered to be DMVPN Phase 2?
|
Hub and Spoke with Spoke-to-Spoke (mGRE Everywhere)
|
|
|
What is considered to be DMVPN Phase 3?
|
Scalable Infrastructure
|
|
|
True/False: mGRE is essentially just a NBMA medium?
|
True
|
|
|
What is the function of a Next Hop Client (NHC)?
|
It registers with the Next Hop Server (NHS) with its IP address mapped to a NBMA Layer 2 address (NSAP Address).
|
|
|
What is the function of a Next Hop Server (NHS)?
|
It acts as a database agent storing all registered mappings and replies to Next Hop Client (NHC) queries.
|
|
|
What is required if you run EIGRP or RIP over a mGRE topology?
|
Split-Horizon to be disabled.
|
|
|
How do you configure a tunnel to be a mGRE tunnel?
|
(config-if)tunnel mode gre multipoint
|
|
|
True/False: You need to configure mGRE encapsulation on both hub and spoke routers?
|
False, only the hub.
|
|
|
How do you configure Next Hop Resolution Protocol authentication with a key of TEST?
|
(config-if)ip nhrp authentication TEST
|
|
|
True/False: The network-id and authentication must match on all routers sharing the same GRE tunnel?
|
True
|
|
|
True/False: The network-id is mandatory for mGRE?
|
True
|
|
|
What does the authoritative flag mean in the 'show ip nhrp detail' command?
|
Means the NHS has learned abou the NHRP mapping directly from a registration request.
|
|
|
What happens if the Next Hop Server (NHS) has already learned a mapping to an IP and the entry is set as unique?
|
The serve rwill reject the registration until the unique entry expires.
|
|
|
How do you prevent a Next Hop Client (NHC) from registering a unique NHRP mapping?
|
(config-if)ip nhrp registration no-unique
|
|
|
What command should you use if you decide to choose OSPF as the routing protocol in a mGRE setup?
|
(config-if)ip ospf network point-to-multipoint
|
|
|
What is the main disadvantage of using a Phase 1 mGRE?
|
The inability to establish spoke-to-spoke shortcut tunnels.
|
|
|
When a spoke wants to communicate with another spoke in a Phase 2 mGRE configuration...what does the NHS reply with?
|
NHRP resolution reply from its cache which shows the NBMA address of the other spoke router.
|
|
|
True/False: CEF is required for Phase 2 mGRE?
|
True
|
|
|
True/False: 'tunnel mode gre multipoint' is needed on both the hub and spoke routers in Phase 2 mGRE?
|
True
|
|
|
If you see 'valid glean adjacency' is seen when viewing 'show ip cef' in mGRE...what does that mean?
|
Means the router needs to send an NHRP resolution request to map the logical IP to NBMA address.
|
