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1. In MPLS - a term used to define a label that an LSR learned from a neighboring LSR.
Label Switch Router
2. The number of beacons that governs how often multicast frames are sent over a wireless LAN.
modified tail drop
3. The RMON function of sending a notification to an RMON collector or the console. Triggered by an RMON event.
dual-rate - three-color policer
shared distribution tree
4. The Cisco IOS feature by which special short key sequences can be used to move the cursor inside the current command line to more easily change a command.
VRRP Master router
5. A Cisco IOS configuration tool for routing protocols by which routing updates may be filtered.
All OSPF DR Routers
6. When a PIM-SM router switches from RPT to SPT - it sends a PIM-SM Prune message for the source and the group with the RP bit set to its upstream router on the shared tree. RFC 2362 uses the notation PIM-SM (S - G) RP-bit Prune for this message.
PIM-SM (S -G) RP-bit Prune
maximum reserved bandwidth
7. Exterior Gateway Protocol.
permanent virtual circuit
8. With Spanning Tree Protocol - the single port on each LAN segment from which the best Hello BPDU is forwarded.
9. A possible side effect of a scheduler that performs strict-priority scheduling of a queue - which can result in lower-priority queues getting little or no service.
10. A set of QoS RFCs that redefines the IP header's ToS byte - and suggests specific settings of the DSCP field and the implied QoS actions based on those settings.
penultimate hop popping (PHP)
11. In IP routing - a term referring to the process of forwarding packets through a router.
network allocation vector
12. The encapsulation of EAP messages directly inside LAN frames. This encapsulation is used between the supplicant and the authenticator.
EAP over LAN
13. As defined in RFC 3623 - graceful restart allows for uninterrupted forwarding in the event that an OSPF router's OSPF routing process must restart. The router does this by first notifying the neighbor routers that the restart is about to occur; the n
graceful restart (OSPF)
VLAN Trunking Protocol
Area Border Router
14. Port Address Translation.
transient multicast group
15. A local Cisco-proprietary BGP setting that is not advertised to any peers. A larger value is considered to be better.
Time to Live
Inside Local address
16. The original standardized set of generic SNMP MIB variables - defined in RFC 1158.
17. A mapping between each DSCP value and a corresponding CoS value - often used in Cisco LAN switches when performing classification for egress queuing.
19. An integer setting for EIGRP and IGRP. Any FS route whose metric is less than this variance multiplier times the successor's metric is added to the routing table - within the restrictions of the maximum-paths command.
Dynamic Host Configuration Protocol
Virtual Router Redundancy Protocol
20. In MPLS VPNs - an entity in a single router that provides a means to separate routes in different VPNs. The VRF includes per-VRF instances of routing protocols - a routing table - and an associated CEF FIB.
CDP Control Protocol
All OSPF Routers
Virtual Routing and Forwarding table
21. Policing in which a single rate is metered - and packets are placed into one of two categories (conform or exceed).
single-rate - two-color policer
22. A queuing scheduler's logic by which - if a particular queue has packets in it - those packets always get serviced next.
average queue depth
23. A feature of Ethernet NICs. When the NIC transmits an electrical signal - it "loops" the transmitted electrical current back onto the receive pair. By doing so - if another NIC transmits a frame at the same time - the NIC can detect the overlapping r
24. A WFQ term referring to its drop logic - which is similar to tail-drop behavior.
modified tail drop
label switched path
25. The combination of MPLS labels and links over which a packet will be forwarded over an MPLS network - from the point of ingress to the MPLS network to the point of egress.
Multicast Open Shortest Path First
label switched path
fully adjacent (OSPF)
26. An architecture and set of documents that defines Cisco's best recommendations for how to secure a network.
wireless LAN controller
27. A switch feature that limits the number of allowed MAC addresses on a port - with optional limits based on the actual values of the MAC addresses.
Data Terminal Ready
28. A CBWFQ and LLQ term referring to the bandwidth on an interface that is neither reserved nor allocated via a priority command.
IGMPv3 Host Membership Query
29. Flush timer.
30. A type of logic for how a router uses a default route. When a default route exists - and the class A - B - or C network for the destination IP address does not exist in the routing table - the default route is used. If any part of that classful netwo
administratively scoped addresses
Password Authentication Protocol
31. The IP address used by hosts as the default gateway in a VRRP configuration. This address is shared by two or more VRRP routers - much as HSRP works.
partial SPF calculation
Router-Port Group Management Protocol
virtual IP address
32. A BGP path attribute that lists ASNs through which the route has been advertised. The AS_PATH includes four types of segments: AS_SEQ - AS_SET - AS_CONFED_SEQ - and AS_CONFED_SET. Often - this term is used synonymously with AS_SEQ
33. A NAT term describing an IP address representing a host that resides outside the enterprise network - with the address being used in packets inside the enterprise network.
Outside Local address
34. Reverse ARP.
link-state routing protocol
sequence number (OSPF)
35. An STP timer that dictates the interval at which the Root switch generates and sends Hello BPDUs.
Multiple Spanning Trees
network allocation vector
36. From a Layer 1 perspective - the process of using special strings of electrical signals over a transmission medium to inform the receiver as to which bits are overhead bits - and which fit into individual subchannels.
37. The common set of IOS configuration commands that is used with each QoS feature whose name begins with "Class-Based."
Modular QoS CLI
38. A single address in each subnet for which packets sent to this address will be broadcast to all hosts in the subnet. It is the highest numeric value in the range of IP addresses implied by a subnet number and prefix/mask.
subnet broadcast address
weighted random early detection
39. A process whereby a switch - when making a forwarding decision - uses not only Layer 2 logic but other OSI layer equivalents as well.
40. IP routing The simplest MPLS application - involving the advertisement of an IGP to learn IP routes - and LDP or TDP to advertise labels.
41. A mechanism used by TCP senders to limit the dynamic window for a TCP connection - to reduce the sending rate when packet loss occurs. The sender considers both the advertised window size and CWND - using the smaller of the two.
Port Address Translation
Challenge Handshake Authentication Protocol
42. A T1 alarm state that occurs when a device receives a Yellow Alarm signal. This typically means that the device on the other end of the line is in a Red Alarm state.
Internet Group Management Protocol
Measured Round-Trip Time
43. A protocol used for reliable multicast and unicast transmissions. Used by EIGRP.
Reliable Transport Protocol
query scope (EIGRP)
44. A standard (RFC 951) protocol by which a LAN-attached host can dynamically broadcast a request for a server to assign it an IP address - along with other configuration settings - including a subnet mask and default gateway IP address.
Network Address Translation
45. Orthogonal frequency division multiplexing.
Spanning Tree Protocol
Digital Signal Level 1
46. Excess Burst.
Diffusing Update Algorithm
47. Internal BGP.
48. A Cisco-proprietary feature. After a Cisco multicast router receives IGMP Join or Leave messages from hosts - it communicates to the connected Cisco switches - telling them which hosts (based on their unicast MAC addresses) have joined or left each m
DR election (OSPF)
Cisco Group Management Protocol
49. An optimized Layer 3 forwarding path through a router or switch. CEF optimizes routing table lookup by creating a special - easily searched tree structure based on the contents of the IP routing table. The forwarding information is called the Forward
Cisco Express Forwarding
50. Secure Shell protocol used for character-oriented command-line access and configuration. A highly secure alternative to Telnet.
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