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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. What is the role of a Switch Engine (SE) in first generation MLS?
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Content-Addressable Memory
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

2. What combinations are TCAM entries composed of?
Multilayer Switching
Value - Mask - and Result (VMR)
By Mask/Value - where each unique mask has eight value patterns associated with it
Cisco Express Forwarding

3. What is 10GBASE-CX4?
Switch(config)#errdisable detect cause l2ptguard
70 km for 9 micron SMF; 100 km for 8 micron SMF
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
They are dropped (ARP throttling)

4. What is 1000BASE-X?
Down - static access - trunk or tunnel
Wide-Wavelength Division Multiplexing
Cabling specifications for Gigabit Ethernet
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

5. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Switch(config)#errdisable detect cause udld
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Full duplex

6. What is WWDM?
With a mask value in addition to binary values to decide which keys in a table are relevant
Logical Operation Unit
Wide-Wavelength Division Multiplexing
Switch#show interfaces status err-disabled

7. What are the common cabling specifications for Fast Ethernet?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Dynamic
FIB with adjacency table
Switch(config)#interface range macro {name}

8. What tables are maintained by the CEF Layer 3 engine?
10 km
When one station transmits at the same time as another on a shared medium
Routing table and ARP table
Source MAC address; Port of arrival; VLAN; Time stamp

9. Creates an interface-range macro
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause security-violation
CEF punt
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

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

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11. What is 100BASE-FX?
Switch(config-if)#switchport access vlan {vlan}
Multilayer Switching
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch#show errdisable detect

12. What CEF optimisation replicates the entire FIB table among switch line cards?
Switch#show interfaces status
Distributed CEF (dCEF)
On
Interconnecting switches in a campus network

13. Enables error-disable when trunking encapsulation is flapping from one type to another
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
1 -2 on one end with 3 -6 on the other end
Switch(config)#errdisable detect cause dtp-flap
Switch#show running-config interface {interface}

14. What are the names of the two basic generations of MLS?
Switch#show errdisable recovery
Route caching and topology based
Collision domain
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

15. What is 10GBASE-LR/LW?
Switch(config-if)#duplex {auto | full | half}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
In TCAM Value entries
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

16. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
IEEE 802.3
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Native routed interface

17. Enables error-disable detection
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause {all | {cause-name}}
The Punt adjacency
Content-Addressable Memory

18. What is the administrative mode of a switch port that is a member of one VLAN?
In TCAM Value entries
Switch(config)#errdisable detect cause dhcp-rate-limit
Static access or dynamic
Forwarding Information Base

19. What is the standard for Fast Ethernet (100 Mbps)?
IEEE 802.3u
300 seconds
Tunnel
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

20. What is the maximum cabling distance for 10GBASE-SR/SW?
American National Standards Institute
100 metres
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

21. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
Tunnel
Switched virtual interface (SVI)
ANSI X3T11 FibreChannel
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

22. When can a switch start to learn source MAC addresses on incoming ports?
SVI
Accelerated CEF (aCEF)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Tunnel

23. What tables are maintained by the CEF Layer 3 forwarding engine?
Switch(config)#interface range macro {name}
FIB with adjacency table
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

24. Displays CEF Drop statistics with number of packets and reason for each line card
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch#show ip cef
Switch(config)#errdisable detect cause rootguard
Switch#show cef drop

25. Disables CEF operation globally
Switch(config)#no ip cef
Switch(config)#errdisable detect cause channel-misconfig
Switch(config)#interface {type}{module}/{number}
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

26. What are the reasons for packets being punted by CEF?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
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
40 km
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

27. Disables CEF operation on an interface
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
The Punt adjacency
Switch(config-if)#no ip route-cache cef

28. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
10GbE operates only at full duplex
LAN PHY and WAN PHY
Switch(config)#errdisable detect cause rootguard
Half duplex

29. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause udld
15 metres
Accelerated CEF (aCEF)
Switch#show cef drop

30. What is the TCAM Value and Mask for an IP access list?
Switch(config)#errdisable detect cause pagp-flap
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
SC or MT-RJ
Only temporarily for debugging purposes

31. What is 10GBASE-SR/SW?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Creating the VLAN
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Store-and-forward

32. What is the default age-out time for stale entries in the CAM table?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
300 seconds
Switch(config)#errdisable detect cause {all | {cause-name}}
SVI or native routed interface

33. Adds a description to an interface configuration
Switch(config-if)#description {string}
CEF punt
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

34. When should CEF be disabled?
Enable error-disable for all possible causes
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause ilpower
Configure the appropriate values manually on both ends of the link

35. What CEF adjacency is used to switch packets that can't be forwarded normally?
The Drop adjacency
Switch#show interfaces status err-disabled
Down - static access - trunk or tunnel
Switch(config)#errdisable recovery interval {seconds}

36. What is the prerequesite for creating a working SVI?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#interface vlan {vlan-id}
Creating the VLAN
Switch#show ip cef

37. Displays interface configuration information
Multilayer Switching
Switch#show running-config interface {interface}
300 seconds
Configure the appropriate values manually on both ends of the link

38. Specifies the timer for automatic re-enabling of error-disabled ports
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable recovery interval {seconds}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [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

39. What is the content of TCAM Mask entries?

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40. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
400 metres half duplex and 2000 metres full duplex
R = LAN PHY; W = WAN PHY
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Process the first packet in a traffic flow to determine the destination

41. What is the standard for Gigabit Ethernet (1000 Mbps)?
Packets that have been truncated before they were fully received
Full duplex
Half duplex
IEEE 802.3z

42. Displays a list of all interfaces in an error-disabled state
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
LAN PHY and WAN PHY
XENPAK - X2 - or SFP+
Switch#show interfaces status err-disabled

43. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
Interconnecting switches in a campus network
A three-fold combination of 0 - 1 and X (don't care)
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

44. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Creating the VLAN
Switch(config)#errdisable detect cause bpduguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Full duplex only

45. What is CSMA/CD?
CEF glean
Trunk
Carrier Sense Multiple Access Collision Detection
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

46. What is 1000BASE-LX/LH?
Switch#show ip cef {interface} [detail]
Multilayer Switching
LAN PHY and WAN PHY
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

47. Sets the duplex mode of an Ethernet or Fast Ethernet interface
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Store-and-forward
SC fibre optic or RJ-45 UTP
Switch(config-if)#duplex {auto | full | half}

48. What is the timer range for automatic re-enabling of error-disabled ports?
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
The Discard adjacency
From 30 seconds to 86 -400 seconds (24 hours)
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

49. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
400 metres half duplex and 2000 metres full duplex
The Layer 3 engine
Switch(config)#errdisable recovery cause {all | {cause-name}}

50. What is CAM?
Content-Addressable Memory
Switch#show errdisable detect
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
IEEE 802.3ae