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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 name of the switching technology where good frames are received - stored for inspection and then forwarded?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Store-and-forward
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

2. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
CEF glean
1 -2 on one end with 3 -6 on the other end
Switch(config)#errdisable detect cause arp-inspection

3. What is EMI?
Electromagnetic Interference
Cabling specifications for Gigabit Ethernet
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Wide-Wavelength Division Multiplexing

4. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#errdisable detect cause pagp-flap
Tunnel
LOU registers
By Mask/Value - where each unique mask has eight value patterns associated with it

5. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
300 seconds
Switch(config)#errdisable detect cause vmps
Switch#show running-config interface {interface}
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

6. What is the maximum cabling distance for 10GBASE-ER/EW?
Switch#show running-config interface {interface}
Distributed CEF (dCEF)
Static access - trunk - tunnel or dynamic
40 km

7. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Switch(config-if)#no switchport
1 -2 on one end with 3 -6 on the other end
Configure the appropriate values manually on both ends of the link
Switch(config)#errdisable detect cause psecure-violation

8. Enables error-disable when a storm control threshold has been exceeded on a port
Off
Switch(config)#errdisable detect cause storm-control
Static access or trunk
Switch(config)#no ip cef

9. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Tunnel
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch#show errdisable recovery

10. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
SVI
Packets that have been truncated before they were fully received
Tunnel
S = Short; L = Long; E = Extra-long

11. What are the names of the two basic generations of MLS?
IEEE 802.3z
Route caching and topology based
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
300 seconds

12. How is the TCAM organised?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
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

13. What is the standard for 10 Gigabit Ethernet (10GbE)?
Compiling Access Control Entries (ACE) into the TCAM table
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
With a mask value in addition to binary values to decide which keys in a table are relevant
IEEE 802.3ae

14. What is unknown unicast flooding?
From 30 seconds to 86 -400 seconds (24 hours)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
15 metres

15. What is a SVI?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Off
100 metres
Switched virtual interface (SVI)

16. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
Logical Operation Unit
With a mask value in addition to binary values to decide which keys in a table are relevant
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

17. What tables are maintained by the CEF Layer 3 forwarding engine?
FIB with adjacency table
Source MAC address; Port of arrival; VLAN; Time stamp
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
SVI

18. What information is stored in TCAM?
Security and QoS ACLs
Down - static access - trunk or tunnel
Source MAC address; Port of arrival; VLAN; Time stamp
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

19. What is the maximum cabling distance for 10GBASE-LX4/LW4?
70 km for 9 micron SMF; 100 km for 8 micron SMF
XENPAK - X2 - or SFP+
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

20. Configures the maximum ageing time for entries in the MAC address table
Switch(config)#mac address-table aging-time {seconds}
Switch(config-if)#duplex {auto | full | half}
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

21. What is WAN PHY used for?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
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
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

22. Displays administrative and operational status for a specified interface
FIB with adjacency table
Interconnecting switches in a campus network
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show interfaces {interface}

23. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
S = Short; L = Long; E = Extra-long
Dynamic
Cabling specifications for Gigabit Ethernet
The Layer 3 engine

24. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Process the first packet in a traffic flow to determine the destination
400 metres half duplex and 2000 metres full duplex
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable detect cause unicast-flood

25. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
LAN PHY and WAN PHY
Switch#show running-config interface {interface}
Interconnecting switches in a campus network
Switch(config)#errdisable detect cause dhcp-rate-limit

26. What is the TCAM Value and Mask for an IP access list?
10 km
Manually by administratively disabling and re-enabling the port
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config-if)#no switchport

27. What is WWDM?
Switch#show ip cef
Routing table and ARP table
Wide-Wavelength Division Multiplexing
The Layer 3 forwarding engine

28. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause vmps
Ternary Content-Addressable Memory
IEEE 802.3ae
Switch(config)#errdisable detect cause gbic-invalid

29. How are ternary combinations implemented?
Content-Addressable Memory
Switch(config-if)#duplex {auto | full | half}
With a mask value in addition to binary values to decide which keys in a table are relevant
Institute of Electrical and Electronics Engineers

30. What is the name of physical network segment where data packets can collide with one another when being sent?
Switch#show adjacency [{interface}] [summary | detail]
Collision domain
Switch(config)#errdisable detect cause channel-misconfig
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

31. What is the maximum cabling distance for 1000BASE-LX/LH?
Off
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#errdisable detect cause arp-inspection

32. Specifies the timer for automatic re-enabling of error-disabled ports
Interconnecting switches in a campus network
The Punt adjacency
Switch(config)#errdisable recovery interval {seconds}
Switch(config)#errdisable detect cause l2ptguard

33. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
CEF punt
Cisco Express Forwarding
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Half duplex

34. What is the prerequesite for creating a working SVI?
Accelerated CEF (aCEF)
Switch(config)#errdisable recovery cause {all | {cause-name}}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Creating the VLAN

35. Displays the contents of the CAM table
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
The table of learned MAC addresses - ports - and VLAN information
25 metres

36. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch(config)#errdisable detect cause dhcp-rate-limit
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
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#interface vlan {vlan-id}

37. What is 1000BASE-X?
Cabling specifications for Gigabit Ethernet
Switch(config)#no ip cef
IEEE 802.3ae
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

38. What is the content of TCAM Mask entries?

39. How does topology based switching work?
LC - MT-RJ or RJ-45
Dynamic
Switch(config)#mac address-table static {mac-address} vlan {vlan} 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

40. Sets the administrative mode of a switch port to access
Switch(config-if)#switchport mode access
ANSI X3T11 FibreChannel
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)
Switch(config)#errdisable detect cause bpduguard

41. What is the maximum cabling distance for 1000BASE-CX?
Carrier Sense Multiple Access Collision Detection
25 metres
Half duplex
From 30 seconds to 86 -400 seconds (24 hours)

42. What is 10GBASE-LX4/LW4?
Switch(config-if)#switchport mode access
The Discard adjacency
Only temporarily for debugging purposes
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

43. What is 1000BASE-LX/LH?
ANSI X3T11 FibreChannel
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#errdisable detect cause storm-control
IEEE 802.3

44. What is TCAM?
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause dhcp-rate-limit
Compiling Access Control Entries (ACE) into the TCAM table
Half duplex

45. What combinations are TCAM entries composed of?
IEEE 802.3u
S = Short; L = Long; E = Extra-long
70 km for 9 micron SMF; 100 km for 8 micron SMF
Value - Mask - and Result (VMR)

46. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#description {string}
A three-fold combination of 0 - 1 and X (don't care)
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

47. What are the administrative modes of Layer 2 switched interfaces?
Cisco Express Forwarding
Static access - trunk - tunnel or dynamic
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable detect cause pagp-flap

48. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
A three-fold combination of 0 - 1 and X (don't care)
Switch#show ip cef {interface} [detail]
Multilayer Switching

49. What is 100BASE-T4?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
The adjacency table
CEF glean
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

50. What is ANSI?
Store-and-forward
Cisco Express Forwarding
A switch port that has been shut down automatically due to a serious error condition
American National Standards Institute