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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 interface configuration information
Store-and-forward
Institute of Electrical and Electronics Engineers
Switch#show running-config interface {interface}
Wide-Wavelength Division Multiplexing

2. What connectors can be used with SFP modules?
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable detect cause l2ptguard
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
LC - MT-RJ or RJ-45

3. Displays dynamic CAM table entries
Numeric values that represent what action to take after the TCAM lookup occurs
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

4. What is FIB?
Forwarding Information Base
A switch port that has been shut down automatically due to a serious error condition
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
The Null adjacency

5. Disables a switch port
1 -2 on one end with 3 -6 on the other end
Switch(config)#errdisable detect cause udld
Switch(config-if)#shutdown
Forwarding Information Base

6. What is the name of physical network segment where data packets can collide with one another when being sent?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Collision domain

7. What is the TCAM Value and Mask for an IGMP access list?
The CEF entry version number
SC fibre optic or RJ-45 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config-if)#description {string}

8. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
They are dropped (ARP throttling)
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
400 metres half duplex and 2000 metres full duplex
Manually by administratively disabling and re-enabling the port

9. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
LC - MT-RJ or RJ-45
The CEF entry version number
SC or MT-RJ
UTP Fast Ethernet and Gigabit Ethernet

10. What is an interface-range macro?
Switch(config)#no ip cef
LAN PHY and WAN PHY
A name assigned to a ranges of interfaces
Switch(config)#errdisable detect cause arp-inspection

11. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
300 seconds
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause bpduguard
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end

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

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13. What is the maximum cabling distance for 10GBASE-CX4?
15 metres
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause channel-misconfig

14. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
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
70 km for 9 micron SMF; 100 km for 8 micron SMF
Cisco Express Forwarding
Switch(config)#errdisable detect cause {all | {cause-name}}

15. What is the name of a Layer 3 physical interface on a switch?
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable recovery interval {seconds}
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Native routed interface

16. What is Fast EtherChannel (FEC)?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Cabling specifications for 10 Gigabit Ethernet
ANSI X3T11 FibreChannel

17. What is 10GBASE-LX4/LW4?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Creating the VLAN
The Discard adjacency

18. What is the maximum cabling distance for 1000BASE-LX/LH?
Interconnecting switches in a campus network
Switch(config)#errdisable detect cause rootguard
70 km for 9 micron SMF; 100 km for 8 micron SMF
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

19. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Cabling specifications for Gigabit Ethernet
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
Switch(config-if)#description {string}
Switch(config)#errdisable detect cause l2ptguard

20. Enables automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause security-violation
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

21. What is LAN PHY used for?
40 km
Interconnecting switches in a campus network
Switch(config)#errdisable detect cause rootguard
Switch(config)#interface range macro {name}

22. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
A name assigned to a ranges of interfaces
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

23. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show cef drop
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
CEF punt
By Mask/Value - where each unique mask has eight value patterns associated with it

24. What are the common PMD types for 10 Gigabit Ethernet?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
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)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

25. What is CAM?
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
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Content-Addressable Memory
FIB with adjacency table

26. What are the reasons for packets being dropped by CEF?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

27. What information is stored in TCAM?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Carrier Sense Multiple Access Collision Detection
Security and QoS ACLs
In parallel revealing the best (longest) match in a single table lookup

28. What is the role of a Switch Engine (SE) in first generation MLS?
Switch(config)#errdisable detect cause unicast-flood
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Distributed CEF (dCEF)
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

29. What is 100BASE-T2?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
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

30. What is the DTP negotiation mode of a switch port configured as dynamic?
On
Collision domain
Switch(config)#errdisable detect cause pagp-flap
40 km

31. What Ethernet ports allow for autonegotiation?
XENPAK - X2 - or SFP+
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
IEEE 802.3u
UTP Fast Ethernet and Gigabit Ethernet

32. When do collisions occur?
Full duplex
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
When one station transmits at the same time as another on a shared medium

33. What is CSMA/CD?
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#errdisable detect cause psecure-violation
Carrier Sense Multiple Access Collision Detection
Switch(config-if)#no ip route-cache cef

34. 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
Value - Mask - and Result (VMR)
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause bpduguard

35. What is the maximum cabling distance for 10GBASE-SR/SW?
IEEE 802.3ae
Switch#show errdisable detect
The table of learned MAC addresses - ports - and VLAN information
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

36. What is 1000BASE-X?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Cabling specifications for Gigabit Ethernet
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable detect cause {all | {cause-name}}

37. What information is stored in CAM?
Switch(config-if)#description {string}
Switch(config)#errdisable detect cause ilpower
The table of learned MAC addresses - ports - and VLAN information
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

38. Enables error-disable when a storm control threshold has been exceeded on a port
Switch(config)#errdisable detect cause storm-control
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
SC fibre optic or RJ-45 UTP
R = LAN PHY; W = WAN PHY

39. Disables CEF operation on an interface
Value - Mask - and Result (VMR)
Trunk or dynamic
Switch(config-if)#no ip route-cache cef
10 km

40. What connectors can be used with GBIC modules?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch(config)#mac address-table aging-time {seconds}
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
SC fibre optic or RJ-45 UTP

41. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
300 seconds
1 -2 on one end with 3 -6 on the other end
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

42. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
A three-fold combination of 0 - 1 and X (don't care)
300 seconds
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause rootguard

43. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Logical Operation Unit
Switch(config)#errdisable detect cause gbic-invalid

44. What is 1000BASE-T?
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
Security and QoS ACLs
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Collision domain

45. What is the maximum cabling distance for 10GBASE-LR/LW?
SVI
10 km
Switched virtual interface (SVI)
Security and QoS ACLs

46. How is the TCAM organised?
R = LAN PHY; W = WAN PHY
By Mask/Value - where each unique mask has eight value patterns associated with it
Store-and-forward
Switch#show running-config interface {interface}

47. What are the operational modes of a Layer 2 switched interface?
Tunnel
Down - static access - trunk or tunnel
A switch port that has been shut down automatically due to a serious error condition
IEEE 802.3ae

48. What are the Fast Ethernet autonegotiation selection priorities?
Interconnecting switches in a campus network
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Switch#show running-config interface {interface}
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

49. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
Creating the VLAN
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable detect cause udld
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

50. Creates an interface-range macro
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
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#no ip cef
Switch(config)#errdisable detect cause {all | {cause-name}}