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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
A station must wait its turn to transmit; it can't transmit and receive at the same time
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Static access or dynamic
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

2. What is the name of a Layer 3 physical interface on a switch?
Switch(config)#errdisable detect cause rootguard
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Native routed interface
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

3. What is the maximum cabling distance for 1000BASE-SX?
Trunk or dynamic
IEEE 802.3ae
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

4. What are the common PMD types for 10 Gigabit Ethernet?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Wide-Wavelength Division Multiplexing
Switch(config)#errdisable recovery interval {seconds}
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

5. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

6. Enables error-disable for conditions that trigger port security configured on a port
Full duplex
Switch(config)#errdisable detect cause psecure-violation
A station must wait its turn to transmit; it can't transmit and receive at the same time
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

7. What are the types of layer 3 switched interfaces
The adjacency table
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
LOU registers
SVI or native routed interface

8. What are the administrative modes of Layer 2 switched interfaces?
Switch(config)#errdisable detect cause psecure-violation
Distributed CEF (dCEF)
Static access - trunk - tunnel or dynamic
Switch#show interfaces {interface}

9. What is the maximum cabling distance for 10GBASE-SR/SW?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause gbic-invalid
Numeric values that represent what action to take after the TCAM lookup occurs

10. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
On
Switch(config-if)#no switchport
Switch(config)#default interface {interface}
Forwarding Information Base

11. Displays error-disabled detection status
Switch#show errdisable detect
Forwarding Information Base
Switch#show ip cef
Cisco Express Forwarding

12. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#errdisable detect cause bpduguard
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

13. What is the timer range for automatic re-enabling of error-disabled ports?
FIB with adjacency table
Switch#show running-config interface {interface}
Content-Addressable Memory
From 30 seconds to 86 -400 seconds (24 hours)

14. What is the DTP negotiation mode of a switch port configured as trunk?
On
Switch(config)#interface vlan {vlan-id}
Institute of Electrical and Electronics Engineers
Switch(config)#errdisable detect cause security-violation

15. What connectors can be used with GBIC modules?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
SC fibre optic or RJ-45 UTP
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

16. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
10GbE operates only at full duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Ternary Content-Addressable Memory
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

17. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
100 metres
A name assigned to a ranges of interfaces
Distributed CEF (dCEF)
Switch(config)#errdisable detect cause pagp-flap

18. What is the role of a Route Processor (RP) in first generation MLS?
Process the first packet in a traffic flow to determine the destination
Switch#show errdisable recovery
400 metres half duplex and 2000 metres full duplex
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

19. What is 10GBASE-X?
Numeric values that represent what action to take after the TCAM lookup occurs
Cabling specifications for 10 Gigabit Ethernet
300 seconds
Manually by administratively disabling and re-enabling the port

20. Enables error-disable for rate-limiting of DHCP snooping
Routing table and ARP table
A name assigned to a ranges of interfaces
The Punt adjacency
Switch(config)#errdisable detect cause dhcp-rate-limit

21. What information is stored in CAM?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Static access
The table of learned MAC addresses - ports - and VLAN information
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

22. What is the name of physical network segment where data packets can collide with one another when being sent?
The table of learned MAC addresses - ports - and VLAN information
Packets that have been truncated before they were fully received
Collision domain
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

23. How is the TCAM organised?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Routing table and ARP table
By Mask/Value - where each unique mask has eight value patterns associated with it
Interconnecting switches in a campus network

24. What CEF adjacency is used to switch packets destined for the null interface?
The Null adjacency
Full duplex
Switch(config)#errdisable detect cause {all | {cause-name}}
LC - MT-RJ or RJ-45

25. What is the maximum cabling distance for 10GBASE-LX4/LW4?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
SC or MT-RJ
Switch(config)#errdisable recovery interval {seconds}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

26. How does topology based switching work?
Switch(config)#errdisable detect cause udld
Collision domain
Switch#show running-config interface {interface}
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding

27. What two IOS software components are involved in TCAM operation?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Configure the appropriate values manually on both ends of the link
Feature Manager (FM) and Switching Database Manager (SDM)
On

28. What is the default age-out time for stale entries in the CAM table?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Carrier Sense Multiple Access Collision Detection
300 seconds
Switch#show interfaces status err-disabled

29. What information is stored in TCAM?
In TCAM Value entries
A switch port that has been shut down automatically due to a serious error condition
Security and QoS ACLs
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

30. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
The CEF entry version number
100 metres
Switch(config)#no ip cef
Process the first packet in a traffic flow to determine the destination

31. What is 10GBASE-SR/SW?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
The Layer 3 forwarding engine
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

32. What packets are immediately sent to the CEF Layer 3 engine for further processing?

33. What is the TCAM Value and Mask for an ICMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch#show adjacency [{interface}] [summary | detail]
IEEE 802.3u
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

34. When can a switch start to learn source MAC addresses on incoming ports?
Packets that have been truncated before they were fully received
1000BASE-T full duplex followed by 1000BASE-T half duplex
Static access
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

35. Displays a list of all interfaces in an error-disabled state
Switch(config)#errdisable detect cause ilpower
Switch#show interfaces status err-disabled
Switch(config)#errdisable detect cause channel-misconfig
Cisco Express Forwarding

36. Enables error-disable when a storm control threshold has been exceeded on a port
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
CEF glean
Switch(config)#errdisable detect cause storm-control

37. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Cisco Express Forwarding
The switch port falls back to default setting of half duplex
Switch(config)#errdisable detect cause vmps

38. What are the reasons for packets being punted by CEF?
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Switched virtual interface (SVI)
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

39. What is 10GBASE-LR/LW?
Dynamic
Down - static access - trunk or tunnel
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

40. Displays a list with status of all interfaces
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show interfaces status
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Configure the appropriate values manually on both ends of the link

41. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
300 seconds
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Packets that have been truncated before they were fully received
In TCAM Value entries

42. What are the names of the two basic generations of MLS?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Route caching and topology based
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch#show errdisable detect

43. What is the default duplex mode of a Gigabit Ethernet interface?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Full duplex
With a mask value in addition to binary values to decide which keys in a table are relevant

44. Displays CEF adjacency table information
CEF glean
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch#show adjacency [{interface}] [summary | detail]
LAN PHY and WAN PHY

45. What is LOU?
Switch#show adjacency [{interface}] [summary | detail]
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Logical Operation Unit
Switch#show interfaces status

46. What is error-disable state?
Accelerated CEF (aCEF)
A switch port that has been shut down automatically due to a serious error condition
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Trunk or dynamic

47. What are the Gigabit Ethernet autonegotiation selection priorities?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Ternary Content-Addressable Memory
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
The Layer 3 engine

48. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#no ip cef
Switch#show errdisable recovery
25 metres
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

49. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
400 metres half duplex and 2000 metres full duplex
Half duplex
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Manually by administratively disabling and re-enabling the port

50. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
The adjacency table